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PHP 转义正则表达式字符: preg_quote

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PHP 转义正则表达式字符: preg_quote

 preg_quote — 转义正则表达式字符

string preg_quote ( string $str [, string $delimiter = NULL ] )

preg_quote()需要参数str并向其中 每个正则表达式语法中的字符前增加一个反斜线. 这通常用于你有一些运行时字符串 需要作为正则表达式进行匹配的时候.

正则表达式特殊字符有: . \ + * ? [ ^ ] $ ( ) { } = ! | : -

参数

str

输入字符串

delimiter

如果指定了可选参数delimiter, 它也会被转义. 这通常用于 转义PCRE函数使用的分隔符. /是最通用的分隔符.

 

返回值

返回转义后的字符串.

preg_quote()示例

$keywords = '$40 for a g3/400';
$keywords = preg_quote($keywords, '/');
echo $keywords; // 返回 \$40 for a g3\/400
?>

source:php.cn
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