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Similarly, <code>$</code><i>n</i> coincides with <code>substr $_, $-[</code><i>n</i><code>], $+[</code><i>n</i><code>] - $-[</code><i>n</i><code>]</code> if <code>$-[</code><i>n</i><code>]</code> is defined, and $+ coincides with <code>substr $_, $-[$#-], $+[$#-]</code>. One can use <code>$#-</code> to find the last matched subgroup in the last successful match. Contrast with <code>$#+</code>, the number of subgroups in the regular expression. Compare with <code>@+</code>.</p> <p>This array holds the offsets of the beginnings of the last successful submatches in the currently active dynamic scope. <code>$-[0]</code> is the offset into the string of the beginning of the entire match. The <i>n</i>th element of this array holds the offset of the <i>n</i>th submatch, so <code>$+[1]</code> is the offset where $1 begins, <code>$+[2]</code> the offset where $2 begins, and so on. You can use <code>$#-</code> to determine how many subgroups were in the last successful match. Compare with the <code>@+</code> variable.</p> <p>After a match against some variable $var:</p> <dl> <dt id="$`-is-the-same-as-substr($var,-0,-$-[0])"><a class="permalink" href="#$%60-is-the-same-as-substr($var,-0,-$-%5B0%5D)">#</a><a id="is-the-same-as-substr-var-0---0"></a><code>$`</code> is the same as <code>substr($var, 0, $-[0])</code></dt> <dd> </dd> <dt id="$&-is-the-same-as-substr($var,-$-[0],-$+[0]-$-[0])"><a class="permalink" href="#$&-is-the-same-as-substr($var,-$-%5B0%5D,-$+%5B0%5D-$-%5B0%5D)">#</a><a id="is-the-same-as-substr-var---0-0-----0"></a><code>$&</code> is the same as <code>substr($var, $-[0], $+[0] - $-[0])</code></dt> <dd> </dd> <dt id="$'-is-the-same-as-substr($var,-$+[0])"><a class="permalink" href="#$'-is-the-same-as-substr($var,-$+%5B0%5D)">#</a><a id="is-the-same-as-substr-var-0"></a><code>$'</code> is the same as <code>substr($var, $+[0])</code></dt> <dd> </dd> <dt id="$1-is-the-same-as-substr($var,-$-[1],-$+[1]-$-[1])"><a class="permalink" href="#$1-is-the-same-as-substr($var,-$-%5B1%5D,-$+%5B1%5D-$-%5B1%5D)">#</a><a id="is-the-same-as-substr-var---1-1-----1"></a><code>$1</code> is the same as <code>substr($var, $-[1], $+[1] - $-[1])</code></dt> <dd> </dd> <dt id="$2-is-the-same-as-substr($var,-$-[2],-$+[2]-$-[2])"><a class="permalink" href="#$2-is-the-same-as-substr($var,-$-%5B2%5D,-$+%5B2%5D-$-%5B2%5D)">#</a><a id="is-the-same-as-substr-var---2-2-----2"></a><code>$2</code> is the same as <code>substr($var, $-[2], $+[2] - $-[2])</code></dt> <dd> </dd> <dt id="$3-is-the-same-as-substr-$var,-$-[3],-$+[3]-$-[3])"><a class="permalink" href="#$3-is-the-same-as-substr-$var,-$-%5B3%5D,-$+%5B3%5D-$-%5B3%5D)">#</a><a id="is-the-same-as-substr-var---3-3-----3"></a><code>$3</code> is the same as <code>substr $var, $-[3], $+[3] - $-[3])</code></dt> <dd> </dd> </dl> </dd> </dl> </div> <div id="footer"> <p>Perldoc Browser is maintained by Dan Book (<a href="https://metacpan.org/author/DBOOK">DBOOK</a>). Please contact him via the <a href="https://github.com/Grinnz/perldoc-browser/issues">GitHub issue tracker</a> or <a href="mailto:dbook@cpan.org">email</a> regarding any issues with the site itself, search, or rendering of documentation.</p> <p>The Perl documentation is maintained by the Perl 5 Porters in the development of Perl. Please contact them via the <a href="https://github.com/Perl/perl5/issues">Perl issue tracker</a>, the <a href="https://lists.perl.org/list/perl5-porters.html">mailing list</a>, or <a href="https://kiwiirc.com/client/irc.perl.org/p5p">IRC</a> to report any issues with the contents or format of the documentation.</p> </div> </div> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.slim.min.js" integrity="sha512-/DXTXr6nQodMUiq+IUJYCt2PPOUjrHJ9wFrqpJ3XkgPNOZVfMok7cRw6CSxyCQxXn6ozlESsSh1/sMCTF1rL/g==" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.1/umd/popper.min.js" integrity="sha512-ubuT8Z88WxezgSqf3RLuNi5lmjstiJcyezx34yIU2gAHonIi27Na7atqzUZCOoY4CExaoFumzOsFQ2Ch+I/HCw==" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script> <script src="/js/highlight.pack.js"></script> <script>hljs.highlightAll();</script> </body> </html>

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