如何找到包含方括号的字符串? [英] how to find a string containing a square bracket?

问题描述

我正在使用正则表达式在文本中搜索一堆关键字.

i'm using a regular expression to search for a bunch of keywords in a text.

找到所有关键字，但只有一个:[DAM]柏林.我知道它包含一个方括号，所以我逃脱了，但是仍然没有运气.我在做什么错了?

All keywords are found but one: [DAM]Berlin. I know it contains a square bracket so i escaped it, but still, no luck. What am i doing wrong?

这是我的php代码.

要搜索的关键字的文本:

The text to search for keywords:

$textToSearch= '<p><br>
Time ¦ emit LAb[au] <br>
<br>
[DAM]Berlin gallery<br>
<br>
Exhibition: February 21st - March 28th, 2009 <br>
<br>
Opening: Friday,  February 20th, 2009 7-9 pm <br>';

正则表达式:

$find='/(?![^<]+>)\b(generative art console|Game of Life|framework notations|framework|Floating numbers|factorial|f5x5x3|f5x5x1|eversion|A-plus|16n|\[DAM\]Berlin gallery)\b/s';

替换回调函数:

function replaceCallback( $match )
{
      if ( is_array( $match ) )
      {
        $htmlVersion = htmlspecialchars( $match[1], ENT_COMPAT, 'UTF-8' );
        $urlVersion  = urlencode( $match[1] );
        return '<a class="tag" rel="tag-definition" title="Click to know more about ' . $htmlVersion . '" href="?tag=' . $urlVersion. '">'. $htmlVersion  . '</a>';
      }
      return $match;
}

最后是电话:

$tagged_content = preg_replace_callback($find, 'replaceCallback',  $textToSearch);

谢谢您的帮助！

推荐答案

我认为这是因为[不是文字字符"，所以\b[在[ >.您可能需要将正则表达式更改为:

I think it's because [ isn't a "word character", so \b[ can't match [ in the beginning of [DAM]Berlin. You probably need to change your regex to:

$find='/(?![^<]+>)(\b(?:generative art console|Game of Life|framework notations|framework|Floating numbers|factorial|f5x5x3|f5x5x1|eversion|A-plus|16n)|\[DAM\]Berlin gallery)\b/s';

---

来自丹尼尔·詹姆斯(Daniel James)的评论:

---

From Daniel James's comment:

这可能更接近最初的意图，因为它仍然会检查"[Dam]"是否不包含单词字符:

This might be closer to the original intent, as it will still check that '[Dam]' doesn't follow a word character:

$find='/(?![^<]+>)(?<!\w)(generative art console|Game of Life|framework notations|framework|Floating numbers|factorial|f5x5x3|f5x5x1|eversion|A-plus|16n|\[DAM\]Berlin gallery)\b/s';

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