preg_quote

名称:preg_quote

分类:正则处理PCRE

所属语言:php

一句话介绍:通过在正则表达式中添加反斜杠来转义在正则表达式中具有特殊含义的字符。

实例

使用 preg_quote() 在正则表达式中安全地使用特殊字符：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$search</span> <span class="token operator">=</span> <span class="token function">preg_quote</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"://"</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"/"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token variable">$input</span> <span class="token operator">=</span> <span class="token string single-quoted-string">'https://www.gitbox.net/'</span><span class="token punctuation">;</span>
<span class="token variable">$pattern</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"/<span class="token interpolation"><span class="token variable">$search</span></span>/"</span><span class="token punctuation">;</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token function">preg_match</span><span class="token punctuation">(</span><span class="token variable">$pattern</span><span class="token punctuation">,</span> <span class="token variable">$input</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">echo</span> <span class="token string double-quoted-string">"The input is a URL."</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
  <span class="token keyword">echo</span> <span class="token string double-quoted-string">"The input is not a URL."</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token delimiter important">?></span></span>

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