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class="main__header-group"><ol class="breadcrumbs"><li class="breadcrumbs__item breadcrumbs__item_home"><a class="breadcrumbs__link" href="/"><span class="breadcrumbs__hidden-text">Tutorial</span></a></li><li class="breadcrumbs__item" id="breadcrumb-1"><a class="breadcrumbs__link" href="/regular-expressions"><span>Expresiones Regulares</span></a></li><script type="application/ld+json">{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Tutorial","item":"https://es.javascript.info/"},{"@type":"ListItem","position":2,"name":"Expresiones Regulares","item":"https://es.javascript.info/regular-expressions"}]}</script></ol><div class="updated-at" data-tooltip="Última actualización el 28 de noviembre de 2021"><div class="updated-at__content">28 de noviembre de 2021</div></div></div><h1 class="main__header-title">Modo multilínea de anclas ^ $, bandera "m"</h1></div></header><div class="content"><article class="formatted" itemscope itemtype="http://schema.org/TechArticle"><meta itemprop="name" content="Modo multilínea de anclas ^ $, bandera "m""><div itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="email" content="iliakan@gmail.com"><meta itemprop="name" content="Ilya Kantor"></div><div itemprop="articleBody"><p>El modo multilínea está habilitado por el indicador <code class="pattern">m</code>.</p> <p>Solo afecta el comportamiento de <code class="pattern">^</code> y <code class="pattern">$</code>.</p> <p>En el modo multilínea, coinciden no solo al principio y al final de la cadena, sino también al inicio/final de la línea.</p> <h2><a class="main__anchor" name="buscando-al-inicio-de-linea" href="#buscando-al-inicio-de-linea">Buscando al inicio de línea ^</a></h2><p>En el siguiente ejemplo, el texto tiene varias líneas. El patrón <code class="pattern">/^\d/gm</code> toma un dígito desde el principio de cada línea:</p> <div id="e3ljkwqm2h" data-trusted="1" class="code-example" data-highlight="[{"start":4,"end":4}]"> <div class="codebox code-example__codebox"> <div class="toolbar codebox__toolbar"> <div class="toolbar__tool"> <a href="#" title="ejecutar" data-action="run" class="toolbar__button toolbar__button_run"></a> </div> <div class="toolbar__tool"> <a href="#" title="abrir en entorno controlado" target="_blank" data-action="edit" class="toolbar__button toolbar__button_edit"></a> </div> </div> <div class="codebox__code" data-code="1"> <pre class="line-numbers language-javascript"><code>let str = `1er lugar: Winnie 2do lugar: Piglet 3er lugar: Eeyore`; console.log( str.match(/^\d/gm) ); // 1, 2, 3</code></pre> </div> </div> </div><p>Sin la bandera <code class="pattern">m</code> solo coincide el primer dígito:</p> <div id="h8pomu0ceg" data-trusted="1" class="code-example" data-highlight="[{"start":4,"end":4}]"> <div class="codebox code-example__codebox"> <div class="toolbar codebox__toolbar"> <div class="toolbar__tool"> <a href="#" title="ejecutar" data-action="run" class="toolbar__button toolbar__button_run"></a> </div> <div class="toolbar__tool"> <a href="#" title="abrir en entorno controlado" target="_blank" data-action="edit" class="toolbar__button toolbar__button_edit"></a> </div> </div> <div class="codebox__code" data-code="1"> <pre class="line-numbers language-javascript"><code>let str = `1er lugar: Winnie 2do lugar: Piglet 3er lugar: Eeyore`; console.log( str.match(/^\d/g) ); // 1</code></pre> </div> </div> </div><p>Esto se debe a que, de forma predeterminada, un caret <code class="pattern">^</code> solo coincide al inicio del texto y en el modo multilínea, al inicio de cualquier línea.</p> <div class="important important_smart"> <div class="important__header"><span class="important__type">Por favor tome nota:</span></div> <div class="important__content"><p>“Inicio de una línea” significa formalmente “inmediatamente después de un salto de línea”: la prueba <code class="pattern">^</code> en modo multilínea coincide en todas las posiciones precedidas por un carácter de línea nueva <code>\n</code>.</p> <p>Y al comienzo del texto.</p> </div></div> <h2><a class="main__anchor" name="buscando-al-final-de-la-linea" href="#buscando-al-final-de-la-linea">Buscando al final de la línea $</a></h2><p>El signo de dólar <code class="pattern">$</code> se comporta de manera similar.</p> <p>La expresión regular <code class="pattern">\d$</code> encuentra el último dígito en cada línea</p> <div id="2o6q0auwci" data-trusted="1" class="code-example"> <div class="codebox code-example__codebox"> <div class="toolbar codebox__toolbar"> <div class="toolbar__tool"> <a href="#" title="ejecutar" data-action="run" class="toolbar__button toolbar__button_run"></a> </div> <div class="toolbar__tool"> <a href="#" title="abrir en entorno controlado" target="_blank" data-action="edit" class="toolbar__button toolbar__button_edit"></a> </div> </div> <div class="codebox__code" data-code="1"> <pre class="line-numbers language-javascript"><code>let str = `Winnie: 1 Piglet: 2 Eeyore: 3`; console.log( str.match(/\d$/gm) ); // 1,2,3</code></pre> </div> </div> </div><p>Sin la bandera <code class="pattern">m</code>, dólar <code class="pattern">$</code> solo coincidiría con el final del texto completo, por lo que solo se encontraría el último dígito.</p> <div class="important important_smart"> <div class="important__header"><span class="important__type">Por favor tome nota:</span></div> <div class="important__content"><p>“Fin de una línea” significa formalmente “inmediatamente antes de un salto de línea”: la prueba <code class="pattern">$</code> en el modo multilínea coincide en todas las posiciones seguidas por un carácter de línea nueva <code>\n</code>.</p> <p>Y al final del texto.</p> </div></div> <h2><a class="main__anchor" name="buscando-n-en-lugar-de" href="#buscando-n-en-lugar-de">Buscando \n en lugar de ^ $</a></h2><p>Para encontrar una línea nueva, podemos usar no solo las anclas <code class="pattern">^</code> y <code class="pattern">$</code>, sino también el carácter de línea nueva <code>\n</code>.</p> <p>¿Cual es la diferencia? Veamos un ejemplo.</p> <p>Buscamos <code class="pattern">\d\n</code> en lugar de <code class="pattern">\d$</code>:</p> <div id="beydckajkn" data-trusted="1" class="code-example"> <div class="codebox code-example__codebox"> <div class="toolbar codebox__toolbar"> <div class="toolbar__tool"> <a href="#" title="ejecutar" data-action="run" class="toolbar__button toolbar__button_run"></a> </div> <div class="toolbar__tool"> <a href="#" title="abrir en entorno controlado" target="_blank" data-action="edit" class="toolbar__button toolbar__button_edit"></a> </div> </div> <div class="codebox__code" data-code="1"> <pre class="line-numbers language-javascript"><code>let str = `Winnie: 1 Piglet: 2 Eeyore: 3`; console.log( str.match(/\d\n/g) ); // 1\n,2\n</code></pre> </div> </div> </div><p>Como podemos ver, hay 2 coincidencias en lugar de 3.</p> <p>Esto se debe a que no hay una línea nueva después de <code class="subject">3</code> (sin embargo, hay un final de texto, por lo que coincide con <code class="pattern">$</code>).</p> <p>Otra diferencia: ahora cada coincidencia incluye un carácter de línea nueva <code class="match">\n</code>. A diferencia de las anclas <code class="pattern">^</code> <code class="pattern">$</code>, que solo prueban la condición (inicio/final de una línea), <code>\n</code> es un carácter, por lo que se hace parte del resultado.</p> <p>Entonces, un <code>\n</code> en el patrón se usa cuando necesitamos encontrar caracteres de línea nueva, mientras que las anclas se usan para encontrar algo “al principio/al final” de una línea.</p> </div></article></div><div class="page__nav-wrap"><a class="page__nav page__nav_prev" href="/regexp-anchors" data-tooltip="Anclas: inicio ^ y final $ de cadena"><span class="page__nav-text"><span class="page__nav-text-shortcut"></span></span><span class="page__nav-text-alternate">Lección anterior</span></a><a class="page__nav page__nav_next" href="/regexp-boundary" data-tooltip="Límite de palabra: \b"><span class="page__nav-text"><span class="page__nav-text-shortcut"></span></span><span class="page__nav-text-alternate">Próxima lección</span></a></div><div class="article-tablet-foot tablet-only"><div class="article-tablet-foot__layout"><div class="share-icons"><span class="share-icons__title">Compartir</span><a class="share share_tw" href="https://twitter.com/share?url=https%3A%2F%2Fes.javascript.info%2Fregexp-multiline-mode" rel="nofollow"></a><a class="share share_fb" href="https://www.facebook.com/sharer/sharer.php?s=100&p%5Burl%5D=https%3A%2F%2Fes.javascript.info%2Fregexp-multiline-mode" rel="nofollow"></a></div><div class="article-tablet-foot__map"><a class="map" href="/tutorial/map" data-action="tutorial-map"><span class="map__text">Mapa del Tutorial</span></a></div></div></div><div class="comments formatted" id="comments"><div class="comments__header"><h2 class="comments__header-title"><a href="#comments" name="comments">Comentarios</a></h2><div class="comments__read-before"><span class="comments__read-before-link">lea esto antes de comentar…</span><div class="comments__read-before-popup"><div class="comments__read-before-popup-i"><ul><li>Si tiene sugerencias sobre qué mejorar, por favor <a href="https://github.com/javascript-tutorial/en.javascript.info/issues/new">enviar una propuesta de GitHub</a> o una solicitud de extracción en lugar de comentar.</li><li>Si no puede entender algo en el artículo, por favor explique.</li><li>Para insertar algunas palabras de código, use la etiqueta <code><code></code>, para varias líneas – envolverlas en la etiqueta <code><pre></code>, para más de 10 líneas – utilice una entorno controlado (sandbox) (<a href='https://plnkr.co/edit/?p=preview'>plnkr</a>, <a href='https://jsbin.com'>jsbin</a>, <a href='http://codepen.io'>codepen</a>…)</li></ul></div></div></div></div><div id="disqus_thread"></div><script>var disqus_config = function() { if (!this.page) this.page = {}; 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