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# preg_quote

preg_quote -- Quote regular expression characters

## Description

`string preg_quote`(string str);

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:

    . \\ + * ? [ ^ ] $ ( ) { } = ! < > | :

> Note: This function was added in PHP 3.0.9.

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