Php regular expression replacement variable specifies the character method

This article mainly introduces the php regular expression replacement variable specified character method, involves the php regular expression for string replacement techniques, very practical value, for more information about how to replace the specified characters in a regular expression in php, see the following example. Share it with you for your reference. The details are as follows:

Three common methods are introduced here.

Method 1:

Method 2:

Method 3:

All three methods return the same result. The Perl-style regular expression in PHP is exactly the same as that in Perl. quotemeta is also common ..

Some other regular expressions

Example:

$ Text = "foobar123fooabcbar"; $ text = preg_replace ("/foo (? = Bar)/"," *** ", $ text); // match the position in front of the bar *** bar123fooabcbar

$ Text = "foobar123fooabcbar"; $ text = preg_replace ("/(? <= Bar) 123/"," *** ", $ text); // match the position foo *** 123 fooabcbar behind the bar

$ Text = "foobar123fooabcbar"; $ text = preg_replace ("/foo (?! Bar)/"," *** ", $ text); // match the position behind the bar instead of foobar123 *** abcbar

$ Text = "foobar123fooabcbar"; $ text = preg_replace ("/(?
 
I hope this article will help you with php programming.
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