php - addslashes() for preg_replace() 和 co.？

Question

如何转义传入数据，以便在 preg_replace() 和 consorts 中将其用作模式？例如，我需要匹配这个字符串:

/vorschau/

显然，我需要对“v”进行转义，否则会出错。

我在文档中找不到任何内容。是否有某种 addslashes() 或表达式中的解决方法？

Answer 1

如果我没有正确理解你的问题，你正在寻找 preg_quote :

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

preg_quote() takes str and puts a backslash in front of every character that is part of the regular expression syntax.
This is useful if you have a run-time string that you need to match in some text and the string may contain special regex characters.

The special regular expression characters are: . \ + * ? [ ^ ] $ ( )
{ } = ! < > | : -