PHP Regular expression matching verification extraction URL instance summary

A regular expression that matches the URL of the URL:

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(((F|HT) {1}tp://) [-a-za-z0-9@:%_\+.~#?&//=]+)

Example: PHP regular expression automatically matches whether the string is a URL address, and automatically adds a link.

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<?php    Function Autolink ($rurl) {       $rurl = eregi_replace (((F|HT) {1}tp://) [-a-za-z0-9@:%_ \+.~#?&//=]+) ', ' <a href= ' \1 ', Target=_blank rel=nofollow>\1 </a> ', $rurl);  //Rel=nofollow is telling the search engine not to crawl this link       if Strpos ($rurl "http" = = FALSE) {          $rurl = eregi_replace (' www.[ -a-za-z0-9@:%_\+.~#?&//=]+ ) ', ' <a href= ' http://\1 ' target=_blank rel=nofollow >\1</a> ', $rurl);      }else{             $rurl = Eregi_replace ([[: Space:] () [{}]) (www.[ -a-za-z0-9@ :%_\+.~#?&//=]+) ', ' \1<a href= ' http://\2 ' target=_blank rel=nofol low>\2</a> ', $ Rurl);      }       return $rurl;    }     ?

Calling the Autolink () function

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<?php $str = ' http://www.111cn.net '; echo Autolink ($STR); ?>

Example 1 Gets the example of the HTTPS opening

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https?:/ /([-\w\.] +) + (: \d+)? (/([\w/_\.] * (\?\s+)?)? PHP example:automatically link URL ' s inside text. $text = Preg_replace (' @ https?:/ /([-\w\.] +) + (: \d+)? (/([\w/_\.] * (\?\s+)?) @ ', ' <a href= ' >$1</a> ', $text);

Example 2 directly extracts the URL address in <a in the page

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code is as follows

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function match_links ($document) { Preg_match_all ("' <\s*a\s.*?href\s*=\s* ([\] \])? (1) (.*?) \\1| ([^\s\>]+)] [^>]*>? (.*?) </a> ' Isx ', $document, $links); while ($key, $val) = each ($links [2])) { if (!empty ($val)) $match [' link '] [] = $val; } while (the list ($key, $val) = each ($links [3])) { if (!empty ($val)) $match [' link '] [] = $val; } while (the list ($key, $val) = each ($links [4])) { if (!empty ($val)) $match [' content '] = $val; } while (the list ($key, $val) = each ($links [0])) { if (!empty ($val)) $match [' All '] [] = $val; } Return $match; }

Okay, here is the URL to get the address is also introduced, the above several examples of strengths, we can according to their own needs to choose more suitable for their own matching verification of the URL to extract URLs.