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This article is about what php regular expressions are commonly used in. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

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$str = preg_replace ("/ () (. *?) () /",'\ 1\ 2\ 3, $str)

Three subpatterns are used (one in each parenthesis), the first is the link opening tag, the second is the link text, and the third is

Then\ 1,\ 2, and\ 3 in the second parameter represent these three parts. It is not easy to replace them with what they look like.

The PHP function that gets all the link addresses in the page

The following function, written in PHP, can get all the link addresses in any string $string ($string can be a string read directly from a HTML page file), and the results are saved and returned in an array. This function automatically excludes email addresses and there are no duplicate elements in the returned array.

Function GetAllLink ($string) {$string = str_replace ("\ r", ", $string); $string = str_replace ("\ n ",", $string); $regex [url] =" ((http | https | ftp | telnet | news):\ / /)? ([a-z0-9 _\ -\ /\.] +. [] [a-z0-9 a-z0-9 witch purse]%?\ /\.\,\ +\] +) " $regex [email] = "([a-z0-9 _\ -] +) @ ([a-z0-9 _\] +\. [a-z0-9\ -\. _\] +)"; / remove the text $string = eregi_replace ("> [^] +", ", $string) between tags; / / remove non] * >", ", $string); / / replace the required web page link $string = eregi_replace ("

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