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Manual: preg_quote
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preg_quote

(PHP3 >= 3.0.9, PHP4 )

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

Anmerkung: This function was added in PHP 3.0.9.


 User Contributed Notes: preg_quote

monte@ispi.net
18-Nov-1999 05:31
A good example of this is if you want to use a variable as search content that may contain characters with special meaning to PCRE.

Here I am making every occurance of $word italicized in $textbody. The variable $word may contain special characters and they will not affect the regular expression:

$textbody = preg_replace("|\b".preg_quote($word)."\b|","<i>".$word."</i>",$textbody);

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