downloads | documentation | faq | getting help | mailing lists | licenses | wiki | reporting bugs | php.net sites | links | conferences | my php.net

search for in the

preg_replace_callback> <preg_match
[edit] Last updated: Sat, 07 Jan 2012

view this page in

preg_quote

(PHP 4, PHP 5)

preg_quote정규 표현식 문자를 인용

설명

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

preg_quote()str에서 정규 표현식 문법에 포함되는 모든 문자의 앞에 백슬래시를 덧붙입니다. 어떠한 텍스트에 특수 정규 표현식 문자를 포함하는 런타임 문자열을 처리할 때 유용합니다.

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

인수

str

입력 문자열.

delimiter

delimiter를 정의하면, 그 문자들도 이스케이프합니다. PCRE 함수에서 요구하는 구분자를 이스케이프 할 때 유용합니다. /는 가장 널리 사용되는 구분자입니다.

반환값

인용한 문자열을 반환합니다.

예제

Example #1 preg_quote() 예제

<?php
$keywords 
'$40 for a g3/400';
$keywords preg_quote($keywords'/');
echo 
$keywords// \$40 for a g3\/400 를 반환합니다.
?>

Example #2 텍스트 안의 단어를 기울임꼴로

<?php
// 이 예제에서, preg_quote($word)는 정규 표현식에서
// 특별한 의미를 지니는 애스터라이크(*)의 처리에 사용됩니다.

$textbody "This book is *very* difficult to find.";
$word "*very*";
$textbody preg_replace("/" preg_quote($word) . "/",
                         
"<i>" $word "</i>",
                         
$textbody);
?>

주의

Note: 이 함수는 바이너리 안전입니다.



preg_replace_callback> <preg_match
[edit] Last updated: Sat, 07 Jan 2012
 
add a note add a note User Contributed Notes preg_quote
billadoid at gmail dot com 12-Jan-2012 05:11
If you need to quote everything but a wildcard, maybe this function will come handy to you:

<?php
protected function _ruleOptionIsMatched($option, $subject)
{
   
$option = preg_quote($option, '#');
   
$option = str_replace('\*', '.*', $option);

    if(
preg_match("#^$option$#", $subject))
    {
        return
true;
    }
    else
    {
        return
false;
    }
}
?>
admin at nilamo dot com 04-Aug-2010 08:21
@zooly:

And what if $myvar = 'te\\E.t'?  It will match, when it shouldn't.  That's why you should use preg_quote().
zooly 21-Jul-2009 01:07
To escape characters with special meaning, like: .-[]() and so on, use \Q and \E.

For example:

<?php echo ( preg_match('/^'.( $myvar = 'te.t' ).'$/i', 'test') ? 'match' : 'nomatch' ); ?>

Will result in: match

But:

<?php echo ( preg_match('/^\Q'.( $myvar = 'te.t' ).'\E$/i', 'test') ? 'match' : 'nomatch' ); ?>

Will result in: nomatch
alexc223 at NOSPAM dot googlemail dot com 15-Jun-2009 12:41
Not sure why this note got deleted, but hey lets try again:

As of PHP 5.3, bug #47229 has been fixed and preg_quote *will* escape a hyphen (-). This may effect your code so ensure this is one thing you check when moving to 5.3.
frostschutz 20-Mar-2009 02:01
I wanted to escape a string of characters so I could match them in [], i.e. [.,-!"§$%\\\[\]\^].

Unfortunately preg_quote does not escape the - character which has a special meaning in [], i.e. [a-z].

So I used this hack: make - the delimiter of the expression, i.e.

preg_quote(userinput, "-")
preg_replace("-[$userinput]-u", "", $str)

Apparently using a special char as a delimiter of a regular expression disables this character, i.e. even if it's escaped it's not understood as special character for the expression anymore.

so the pattern "-[a\\-z]-u" matches the characters a, - and z, and not abc...xyz.

It would be nice if preg_quote also escaped characters that have special meanings even if they have this meaning only under certain conditions, such as inside [].
krishoog at gmail dot com 13-Oct-2008 07:51
To bizzigul at hotmail dot fr:
It's not a good practice to make somthing work *almost* all of the time. If the input contains a '`' you will still get an error. I recommend using the default delimiter ('/') and also feed this to preg_quote as second argument.
bizzigul at hotmail dot fr 30-Jul-2008 09:10
To prevent any problems, try to always use a delimiter that will *almost* not be used inside the regex, such as ` (back quote)

for example: instead of
<?php preg_match('/foo\/bar\//',$somevar); ?>

use

<?php preg_match('`foo/bar/`',$somevar); ?>

it's that simple! like this, you won't have to bother with delimiters anymore...
Anonymous 26-Dec-2007 03:13
Wondering why your preg_replace fails, even if you have used preg_quote?

Try adding the delimiter / - preg_quote($string, '/');

 
show source | credits | stats | sitemap | contact | advertising | mirror sites