Code of the link address program in php matching characters

Yesterday, if a friend asked me a question, could I check whether the data submitted by the user contains a super connection? If so, I will filter the data directly. Next I will introduce you to the method of filtering connections.

Determines whether a string contains a hyperlink.

The Code is as follows:	Copy code
$ Str = "ssdsf <a target = '_ blank' href = 'HTTP: // www. bKjia. c0m/'> sdf </a> sdfss "; If (preg_match ("/<a/s + href = [^>] *> | </[^ a] * a [^>] *>/I ", $ str )) { Echo "this string has a hyperlink "; } Else { Echo "this string has no hyperlink mark "; } ?>

Next we only need to filter the connection section.

The Code is as follows:	Copy code
<? Php Echo preg_replace ("/(? <= Href =) ([^>] *) (? =>)/I "," # "," <a href = 'www .csdn.net '> hello, click here to see </a> <a href = 'www. bKjia. c0m'> hello, click here to see </a> "); ?>

Regular :/(? <= Href =) ([^>] *) (? => )/

(? <= Exp) match the position behind exp
(? = Exp) match the position before exp
This regular expression matches all non-">" characters before ">" after href =

Example: <a href = 'www. bKjia. c0m'>

Find these characters (URLs) and replace them with # To remove all links in html.

Now I want to share an instance that extracts super connections.

 

The Code is as follows:

Copy code

Function match_links ($ document ){ Preg_match_all ("'<s * .*? Hrefs * = s * (["'])? (? (1 )(.*?) \ 1 | ([^ s>] +) [^>] *>? (.*?) </A> 'isx ", $ document, $ links ); While (list ($ key, $ val) = each ($ links [2]) { If (! Empty ($ val )) $ Match ['link'] [] = $ val; } While (list ($ key, $ val) = each ($ links [3]) { If (! Empty ($ val )) $ Match ['link'] [] = $ val; } While (list ($ key, $ val) = each ($ links [4]) { If (! Empty ($ val )) $ Match ['content'] [] = $ val; } While (list ($ key, $ val) = each ($ links [0]) { If (! Empty ($ val )) $ Match ['all'] [] = $ val; } Return $ match; }