preg_quote
Description
The preg_quote of PCRE for PHP quote regular expression characters.
Special regular expression characters: . \ + * ? [ ^ ] $ ( ) { } = ! < > | : - #
Not a special regular expression character: /
Syntax
preg_quote(
string $str,
?string $delimiter = null
): stringParameters
str
The input string.
delimiter
If the optional delimiter is specified, it will also be escaped. This is useful for escaping the delimiter that is required by the PCRE functions. The / is the most commonly used delimiter.
Return
Returns the quoted (escaped) string.
Examples
1 · str
<? $str = "$40 for a g3/400"; $return = preg_quote($str); echo $return; ?>
\$40 for a g3/400
2 · delimiter
<? $str = "$40 for a g3/400"; $delimiter = "/"; $return = preg_quote($str, $delimiter); echo $return; ?>
\$40 for a g3\/400
3 · asterisk
<? // preg_quote($str) keeps the asterisks from having special meaning to the regular expression $str = "*very*"; $return = preg_quote($str); $pattern = "#$return#"; $replacement = "<i>$str</i>"; $subject = "This book is *very* difficult to find."; $preg_replace = preg_replace($pattern, $replacement, $subject); echo $preg_replace; ?>
This book is <i>*very*</i> difficult to find.
