问题描述
我正在 html 页面上制作 preg_replace.我的模式旨在为 html 中的某些单词添加周围的标签.但是，有时我的正则表达式会修改 html 标签.例如，当我尝试替换此文本时:
I am making a preg_replace on html page. My pattern is aimed to add surrounding tag to some words in html. However, sometimes my regular expression modifies html tags. For example, when I try to replace this text:
<a href="example.com" alt="yasar home page">yasar</a>
这样 yasar 读取 <span class="selected-word">yasar</span> ，我的正则表达式也替换了锚的 alt 属性中的 yasar标签.我使用的当前 preg_replace() 看起来像这样:
So that yasar reads <span class="selected-word">yasar</span> , my regular expression also replaces yasar in alt attribute of anchor tag. Current preg_replace() I am using looks like this:
preg_replace("/(asf|gfd|oyws)/", '<span class=something>${1}</span>',$target);
如何制作正则表达式，使其不匹配 html 标签内的任何内容?
How can I make a regular expression, so that it doesn't match anything inside a html tag?
推荐答案
您可以为此使用断言，因为您只需要确保搜索的词出现在 > 之后的某个时间，或者在任何 < 之前.后一个测试更容易完成，因为前瞻断言可以是可变长度的:
You can use an assertion for that, as you just have to ensure that the searched words occur somewhen after an >, or before any <. The latter test is easier to accomplish as lookahead assertions can be variable length:
/(asf|foo|barr)(?=[^>]*(<|$))/
另见 http://www.regular-expressions.info/lookaround.html 以获得很好的解释断言语法.
See also http://www.regular-expressions.info/lookaround.html for a nice explanation of that assertion syntax.
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