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data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Canadian computer programmer</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">For other uses, see <a href="/wiki/Henry_Spencer_(disambiguation)" class="mw-disambig" title="Henry Spencer (disambiguation)">Henry Spencer (disambiguation)</a>.</div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Henry_Spencer_2023.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Henry_Spencer_2023.jpg/220px-Henry_Spencer_2023.jpg" decoding="async" width="220" height="330" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Henry_Spencer_2023.jpg/330px-Henry_Spencer_2023.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Henry_Spencer_2023.jpg/440px-Henry_Spencer_2023.jpg 2x" data-file-width="1869" data-file-height="2800" /></a><figcaption>Henry Spencer in 2023.</figcaption></figure> <p><b>Henry Spencer</b> (born 1955) is a <a href="/wiki/Canadians" title="Canadians">Canadian</a> <a href="/wiki/Computer_programmer" class="mw-redirect" title="Computer programmer">computer programmer</a> and space enthusiast. He wrote "regex", a widely used <a href="/wiki/Library_(computing)" title="Library (computing)">software library</a> for <a href="/wiki/Regular_expression" title="Regular expression">regular expressions</a>, and co-wrote <a href="/wiki/C_News" title="C News">C News</a>, a <a href="/wiki/Usenet" title="Usenet">Usenet</a> server program. He also wrote <i>The Ten Commandments for <a href="/wiki/C_(programming_language)" title="C (programming language)">C</a> Programmers</i>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> He is coauthor, with David Lawrence, of the book <i>Managing Usenet</i>.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> While working at the <a href="/wiki/University_of_Toronto" title="University of Toronto">University of Toronto</a> he ran the first active Usenet site outside the U.S., starting in 1981. His records from that period were eventually acquired by <a href="/wiki/Google" title="Google">Google</a> to provide an <a href="/wiki/Usenet#Archives" title="Usenet">archive of Usenet</a> in the 1980s. </p><p>The first international Usenet site was run in <a href="/wiki/Ottawa" title="Ottawa">Ottawa</a>, in 1981; however, it is generally not remembered, as it served merely as a read-only medium. Later in 1981, Spencer acquired a Usenet feed from <a href="/wiki/Duke_University" title="Duke University">Duke University</a>, and brought "utzoo" online; the earliest public archives of Usenet date from May 1981 as a result. </p><p>The small size of Usenet in its youthful days, and Spencer's early involvement, made him a well-recognised participant; this is commemorated in <a href="/wiki/Vernor_Vinge" title="Vernor Vinge">Vernor Vinge's</a> 1992 novel <i><a href="/wiki/A_Fire_Upon_the_Deep" title="A Fire Upon the Deep">A Fire Upon the Deep</a></i>. The novel featured an interstellar communications medium remarkably similar to Usenet, down to the author including spurious message headers; one of the characters who appeared solely through postings to this was modeled on Spencer (and, slightly obliquely, named for him). </p><p>He is also credited with the claim that "Those who do not understand Unix are condemned to reinvent it, poorly."<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Preserving_Usenet">Preserving Usenet</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Henry_Spencer&action=edit&section=1" title="Edit section: Preserving Usenet"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In mid-December 2001, Google unveiled its improved Usenet archives, which now go more than a decade deeper into the Internet's past than did the millions of posts that the company had originally acquired when it bought an existing archive called <a href="/wiki/Deja_News" class="mw-redirect" title="Deja News">Deja News</a>. </p><p>Between 1981 and 1991, while running the zoology department's computer system at the University of Toronto, Spencer copied more than 2 million Usenet messages onto magnetic tapes. The 141 tapes wound up at the <a href="/wiki/University_of_Western_Ontario" title="University of Western Ontario">University of Western Ontario</a>, where Google's Michael Schmidt tracked them down and, with the help of David Wiseman and others,<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> got them transferred onto disks and into Google's archives.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Free_software_contributions">Free software contributions</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Henry_Spencer&action=edit&section=2" title="Edit section: Free software contributions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Henry Spencer helped <a href="/wiki/Geoff_Collyer" title="Geoff Collyer">Geoff Collyer</a> write <a href="/wiki/C_News" title="C News">C News</a> in 1987. </p><p>At around the same time he wrote a non-proprietary replacement for <code>regex(3)</code>, the <a href="/wiki/Unix" title="Unix">Unix</a> library for handling <a href="/wiki/Regular_expressions" class="mw-redirect" title="Regular expressions">regular expressions</a>, and made it freely available; his API followed that of <a href="/wiki/Version_8_Unix" class="mw-redirect" title="Version 8 Unix">Eighth Edition</a> <a href="/wiki/Research_Unix" title="Research Unix">Research Unix</a>.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Spencer's library has been used in many software packages, including <a href="/wiki/Tcl" title="Tcl">Tcl</a>, <a href="/wiki/MySQL" title="MySQL">MySQL</a> (prior to MySQL 8.0.4),<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> and <a href="/wiki/PostgreSQL" title="PostgreSQL">PostgreSQL</a>,<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> as well as being adapted for others, including early versions of <a href="/wiki/Perl" title="Perl">Perl</a>. Circa 1993, Spencer donated a second version of his RE library to <a href="/wiki/Berkeley_Software_Distribution" title="Berkeley Software Distribution">4.4BSD</a>, following the <a href="/wiki/POSIX" title="POSIX">POSIX</a> standard for regular expressions. </p><p>Spencer was technical lead on the <a href="/wiki/FreeS/WAN" title="FreeS/WAN">FreeS/WAN</a> project, implementing an <a href="/wiki/IPsec" title="IPsec">IPsec</a> <a href="/wiki/Cryptography" title="Cryptography">cryptographic</a> <a href="/wiki/Protocol_stack" title="Protocol stack">protocol stack</a> for <a href="/wiki/Linux" title="Linux">Linux</a>. </p><p>He also wrote 'aaa' (Amazing Awk Assembler), which is one of the longest and most complex programs ever written in the <a href="/wiki/Awk" class="mw-redirect" title="Awk">awk</a> programming language. </p><p>He also developed a 4 <a href="/wiki/Point_(typography)" title="Point (typography)">point</a> font used by entomologists in labeling pinned insect specimens.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Space">Space</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Henry_Spencer&action=edit&section=3" title="Edit section: Space"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Spencer is a founding member of the <a href="/w/index.php?title=Canadian_Space_Society&action=edit&redlink=1" class="new" title="Canadian Space Society (page does not exist)">Canadian Space Society</a>, and has served on its board of directors several times since 1984. He did mission analysis (planning of launch and orbits) for the CSS's Canadian Solar Sail project (now defunct), and was Software Architect for <a href="/wiki/Microvariability_and_Oscillations_of_STars_telescope" class="mw-redirect" title="Microvariability and Oscillations of STars telescope">MOST</a>, a Canadian science <a href="/wiki/Miniaturized_satellite" class="mw-redirect" title="Miniaturized satellite">microsatellite</a> dedicated to studying variable light from stars and <a href="/wiki/Extrasolar_planet" class="mw-redirect" title="Extrasolar planet">extrasolar planets</a> launched by <a href="/wiki/Eurockot" class="mw-redirect" title="Eurockot">Eurockot</a> in 2003. The <a href="/wiki/Asteroid" title="Asteroid">asteroid</a> <a href="/wiki/117329_Spencer" class="mw-redirect" title="117329 Spencer">117329 Spencer</a> is named in his honour. </p><p>He is a highly regarded space enthusiast, and is a familiar and respected presence on several space forums on Usenet and the <a href="/wiki/Internet" title="Internet">Internet</a>. From 1983 to 2007 Spencer posted over 34,000 messages to the sci.space.* newsgroups. His knowledge of space history and technology is such that the "I Corrected Henry Spencer" virtual <a href="/wiki/T-shirt" title="T-shirt">T-shirt</a> award was created as a reward for anyone who can catch him in an error of fact.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Henry_Spencer&action=edit&section=4" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFSpencer1987" class="citation web cs1">Spencer, Henry (October 14, 1987). <a rel="nofollow" class="external text" href="https://groups.google.com/group/comp.lang.c/msg/08c8c117dd2d13b6">"Ten Commandments For C Programmers"</a>. comp.lang.c.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Ten+Commandments+For+C+Programmers&rft.pub=comp.lang.c&rft.date=1987-10-14&rft.aulast=Spencer&rft.aufirst=Henry&rft_id=https%3A%2F%2Fgroups.google.com%2Fgroup%2Fcomp.lang.c%2Fmsg%2F08c8c117dd2d13b6&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+Spencer" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFLawrenceSpencer1998" class="citation book cs1">Lawrence, David; Spencer, Henry (January 1998). <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/managingusenet00spen"><i>Managing Usenet</i></a></span>. O'Reilly Media. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/1-56592-198-4" title="Special:BookSources/1-56592-198-4"><bdi>1-56592-198-4</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Managing+Usenet&rft.pub=O%27Reilly+Media&rft.date=1998-01&rft.isbn=1-56592-198-4&rft.aulast=Lawrence&rft.aufirst=David&rft.au=Spencer%2C+Henry&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fmanagingusenet00spen&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+Spencer" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFSpencer1987" class="citation web cs1">Spencer, Henry (November 14, 1987). <a rel="nofollow" class="external text" href="https://groups.google.com/forum/#!msg/sci.space.shuttle/L8-Upf8gZoY/NN6ngTI0K0QJ">"space news from Sept 28 AW&ST"</a>. sci.space.shuttle.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=space+news+from+Sept+28+AW%26ST&rft.pub=sci.space.shuttle&rft.date=1987-11-14&rft.aulast=Spencer&rft.aufirst=Henry&rft_id=https%3A%2F%2Fgroups.google.com%2Fforum%2F%23%21msg%2Fsci.space.shuttle%2FL8-Upf8gZoY%2FNN6ngTI0K0QJ&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+Spencer" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFWiseman2001" class="citation web cs1">Wiseman, David G. (December 11, 2001). <a rel="nofollow" class="external text" href="https://archive.today/20050209012732/http://www.csd.uwo.ca/~magi/personal/usenet.html">"Magi's NetNews Archive Involvement"</a>. Archived from <a rel="nofollow" class="external text" href="http://www.csd.uwo.ca/~magi/personal/usenet.html">the original</a> on February 9, 2005.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Magi%27s+NetNews+Archive+Involvement&rft.date=2001-12-11&rft.aulast=Wiseman&rft.aufirst=David+G.&rft_id=http%3A%2F%2Fwww.csd.uwo.ca%2F~magi%2Fpersonal%2Fusenet.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+Spencer" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFMieszkowski2002" class="citation news cs1">Mieszkowski, Katharine (January 8, 2002). <a rel="nofollow" class="external text" href="https://www.salon.com/2002/01/08/saving_usenet/">"The Geeks Who Saved Usenet"</a>. <i>Salon.com</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2023-05-03</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Salon.com&rft.atitle=The+Geeks+Who+Saved+Usenet&rft.date=2002-01-08&rft.aulast=Mieszkowski&rft.aufirst=Katharine&rft_id=https%3A%2F%2Fwww.salon.com%2F2002%2F01%2F08%2Fsaving_usenet%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+Spencer" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFHenry_Spencer1986" class="citation newsgroup cs1">Henry Spencer (1986-01-19). <a rel="nofollow" class="external text" href="https://groups.google.com/forum/#!original/mod.sources/OqVZYQNSmDs/G_T2jHu5QI8J">"regexp(3)"</a>. <a href="/wiki/Usenet_newsgroup" title="Usenet newsgroup">Newsgroup</a>: <a rel="nofollow" class="external text" href="news:mod.sources">mod.sources</a>. <a href="/wiki/Usenet_(identifier)" class="mw-redirect" title="Usenet (identifier)">Usenet:</a> <a rel="nofollow" class="external text" href="news:1316@panda.UUCP">1316@panda.UUCP</a><span class="reference-accessdate">. Retrieved <span class="nowrap">9 January</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=regexp%283%29&rft.pub=mod.sources&rft.date=1986-01-19&rft_id=news%3A1316%40panda.UUCP%23id-name%3DUsenet%3A&rft.au=Henry+Spencer&rft_id=https%3A%2F%2Fgroups.google.com%2Fforum%2F%23%21original%2Fmod.sources%2FOqVZYQNSmDs%2FG_T2jHu5QI8J&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+Spencer" class="Z3988"></span></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://dev.mysql.com/doc/refman/8.0/en/regexp.html#regexp-compatibility">"Regular Expressions"</a>. <i>MySQL 8.0 Reference Manual</i>. <a href="/wiki/Oracle_Corporation" title="Oracle Corporation">Oracle</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2023-05-03</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=MySQL+8.0+Reference+Manual&rft.atitle=Regular+Expressions&rft_id=https%3A%2F%2Fdev.mysql.com%2Fdoc%2Frefman%2F8.0%2Fen%2Fregexp.html%23regexp-compatibility&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+Spencer" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.postgresql.org/docs/current/functions-matching.html#POSIX-SYNTAX-DETAILS">"Regular Expression Details"</a>. <i>PostgreSQL 15.2 Documentation</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2023-05-03</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=PostgreSQL+15.2+Documentation&rft.atitle=Regular+Expression+Details&rft_id=https%3A%2F%2Fwww.postgresql.org%2Fdocs%2Fcurrent%2Ffunctions-matching.html%23POSIX-SYNTAX-DETAILS&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+Spencer" class="Z3988"></span></span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFDarlingPlowright1990" class="citation journal cs1">Darling, D. Christopher; Plowright, R.C. (May–June 1990). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170605084958/http://www.nhm.ac.uk/resources/research-curation/projects/chalcidoids/pdf_Y/DarlinPl990.pdf">"HPLABEL: A Program and Microfont for the Generation of Date / Locality Labels Using a Laser Printer"</a> <span class="cs1-format">(PDF)</span>. <i>Entomological News</i>. <b>101</b> (3). Archived from <a rel="nofollow" class="external text" href="http://www.nhm.ac.uk/resources/research-curation/projects/chalcidoids/pdf_Y/DarlinPl990.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2017-06-05.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Entomological+News&rft.atitle=HPLABEL%3A+A+Program+and+Microfont+for+the+Generation+of+Date+%2F+Locality+Labels+Using+a+Laser+Printer&rft.volume=101&rft.issue=3&rft.date=1990-05%2F1990-06&rft.aulast=Darling&rft.aufirst=D.+Christopher&rft.au=Plowright%2C+R.C.&rft_id=http%3A%2F%2Fwww.nhm.ac.uk%2Fresources%2Fresearch-curation%2Fprojects%2Fchalcidoids%2Fpdf_Y%2FDarlinPl990.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+Spencer" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFYarvin" class="citation web cs1">Yarvin, Norman. <a rel="nofollow" class="external text" href="https://yarchive.net/about.html">"About Yarchive.net"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2023-05-03</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=About+Yarchive.net&rft.aulast=Yarvin&rft.aufirst=Norman&rft_id=https%3A%2F%2Fyarchive.net%2Fabout.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+Spencer" class="Z3988"></span></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Henry_Spencer&action=edit&section=5" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><style data-mw-deduplicate="TemplateStyles:r1237033735">@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}</style><div class="side-box side-box-right plainlinks sistersitebox"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style> <div class="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Wikiquote-logo.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/34px-Wikiquote-logo.svg.png" decoding="async" width="34" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/51px-Wikiquote-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/68px-Wikiquote-logo.svg.png 2x" data-file-width="300" data-file-height="355" /></a></span></div> <div class="side-box-text plainlist">Wikiquote has quotations related to <i><b><a href="https://en.wikiquote.org/wiki/Special:Search/Henry_Spencer" class="extiw" title="q:Special:Search/Henry Spencer">Henry Spencer</a></b></i>.</div></div> </div> <ul><li><a rel="nofollow" class="external text" href="https://www.oreilly.com/pub/au/451">Brief biography of Spencer at O'Reilly Media</a></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20000521225818/http://www.hq.nasa.gov/alsj/henry.html">Spencer presentation at the Apollo Lunar Surface Journal</a></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20080227060138/http://www.newsandevents.utoronto.ca/bin2/011205a.asp">"MOST satellite to rocket into space in October"</a> at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a> (archived February 27, 2008) Janet Wong, News@UofT, December 5, 2001</li> <li><a rel="nofollow" class="external text" href="http://moonandback.com/2013/05/02/henry-spencer-asteroids-101-moonandback-interviews/">Asteroids 101</a> (6:33), <a rel="nofollow" class="external text" href="http://moonandback.com/2013/05/03/henry-spenser-the-dawn-mission-moonandback-interview/">The Dawn Mission</a> (4:38), <a rel="nofollow" class="external text" href="http://moonandback.com/2013/05/04/henry-spenser-early-days-moonandback-interview/">Early Days</a> (6:38) – <a rel="nofollow" class="external text" href="http://moonandback.com/section/news/">Moon and Back</a>, three videos of interviews at SpaceAccess 2013 conference, April 2013.</li> <li><a rel="nofollow" class="external text" href="https://doc.cat-v.org/henry_spencer/ten-commandments">The Ten Commandments for C Programmers (Annotated Edition) by Henry Spencer</a></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFSpencerCollyer1992" class="citation conference cs1"><a class="mw-selflink selflink">Spencer, Henry</a>; <a href="/wiki/Geoff_Collyer" title="Geoff Collyer">Collyer, Geoff</a> (1992). <a rel="nofollow" class="external text" href="https://usenix.org/legacy/publications/library/proceedings/sa92/spencer.pdf">"#ifdef Considered Harmful, or Portability Experience With C News"</a> <span class="cs1-format">(PDF)</span>. <i>USENIX ’92 Proceedings</i>. pp. <span class="nowrap">185–</span>197.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=conference&rft.atitle=%23ifdef+Considered+Harmful%2C+or+Portability+Experience+With+C+News&rft.btitle=USENIX+%E2%80%9992+Proceedings&rft.pages=%3Cspan+class%3D%22nowrap%22%3E185-%3C%2Fspan%3E197&rft.date=1992&rft.aulast=Spencer&rft.aufirst=Henry&rft.au=Collyer%2C+Geoff&rft_id=https%3A%2F%2Fusenix.org%2Flegacy%2Fpublications%2Flibrary%2Fproceedings%2Fsa92%2Fspencer.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+Spencer" class="Z3988"></span> — A paper he wrote with Geoff Collyer about software portability.</li> <li><a rel="nofollow" class="external text" href="https://doc.cat-v.org/henry_spencer/amazing_awk_assembler/">aaa - the Amazing Awk Assembler by Henry Spencer</a></li> <li><a rel="nofollow" class="external text" href="https://doc.cat-v.org/henry_spencer/awf/">awf - the Amazingly Workable Formatter by Henry Spencer</a></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist 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