Specified characters of variables in php regular replacement

The following are three implementations to introduce the specified characters of variables in PHP regular substitution. Computer friends who need to learn can refer to them.

Three methods.

The code is as follows

Copy code

代码如下	复制代码
$str = preg_quote('(银子)'); $txt = '我的呢称(银子)'; echo preg_replace("/($str)/","",$txt); ?>

$str = preg_quote('(silver)');

$txt = 'My nickname (silver)';

代码如下	复制代码
$str = quotemeta('(银子)'); $txt = '我的呢称(银子)'; echo preg_replace("/($str)/","",$txt); ?>

echo preg_replace("/($str)/","$1",$txt);

代码如下	复制代码
$str = '(银子)'; $txt = '我的呢称(银子)'; echo preg_replace("/(Q$strE)/","",$txt); ?>

The code is as follows

Copy code

$str = quotemeta('(silver)');
$txt = 'My nickname (silver)';

echo preg_replace("/($str)/","$1",$txt);

代码如下

复制代码

$text = “foobar123fooabcbar”;

$text = preg_replace(“/foo(?=bar)/”, “***”, $text);

All three methods return the same result. The Perl style regular expression in PHP is exactly the same as Perl. Even the quotemeta is universal..

代码如下

复制代码

$text = “foobar123fooabcbar”;

$text = preg_replace(“/(?<=bar)123/”, “***”, $text);

Some other examples of regular expressions

Example:

The code is as follows

Copy code

代码如下

复制代码

$text = “foobar123fooabcbar”;

$text = preg_replace(“/foo(?!bar)/”, “***”, $text);

$text = “foobar123fooabcbar”; $text = preg_replace(“/foo(?=bar)/”, “***”, $text);

//Match the position in front of bar ***bar123fooabcbar

The code is as follows	Copy code
$text = “foobar123fooabcbar”; $text = preg_replace(“/(?<=bar)123/”, “***”, $text);

//Match the position behind bar foo***123fooabcbar

The code is as follows	Copy code
$text = “foobar123fooabcbar”; $text = preg_replace(“/foo(?!bar)/”, “***”, $text);

//Match a position that is not followed by bar foobar123***abcbar

$text = “foobar123fooabcbar”;

The code is as follows

代码如下

复制代码

$text = “foobar123fooabcbar”;

$text = preg_replace(“/(?

Copy code

$text = preg_replace(“/(?

true

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TechArticleThe following are three implementations to introduce the designated characters of variables in PHP regular substitution. For those who need to learn, Can be used for reference. Three methods. 1. The code is as follows Copy the code ?php $str = preg_qu...

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