php - preg_replace to replace string for matching url - 


function makelinksinthecontent($html) {     $html= preg_replace("/(^|[\n ])([\w]*?)((ht|f)tp(s)?:\/\/[\w]+[^ \,\"\n\r\t<]*)/is", "$1$2<a href=\"$3\" rel=\"nofollow\" >$3</a>", $html);     $html= preg_replace("/(^|[\n ])([\w]*?)((www|ftp)\.[^ \,\"\t\n\r<]*)/is", "$1$2<a href=\"http://$3\" rel=\"nofollow\" >$3</a>", $html);     $html= preg_replace("/(^|[\n ])([a-z0-9&\-_\.]+?)@([\w\-]+\.([\w\-\.]+)+)/i", "$1<a href=\"mailto:$2@$3\" rel=\"nofollow\">$2@$3</a>", $html);      return($html); }

this code.

my need autolinking url. using preg_replace find url , set link url.

for example: "a page contains www.google.com." if pass content makelinksinthecontent($html), return "a page contains www.google.com."

but following url format not getting linked.

  1. (http://www.google.com)

  2. www.test.com()and[]&^%$#@!+|!@#$%^&()_+}{:"?><,./;'[]=-09~`.co,in,com.com

  3. http://www.test.com()and[]&^%$#@!+|!@#$%^&()_+}{:"?><,./;'[]=-09~`.co,in,com.com

  4. https://www.test.com()and[]&^%$#@!+|!@#$%^&()_+}{:"?><,./;'[]=-09~`.co,in,com.com

  5. ftp://www.test.com()and[]&^%$#@!+|!@#$%^&()_+}{:"?><,./;'[]=-09~`.co,in,com.com

i think regular expression have mistakes. please suggest us.

you can use preg_replace_callback in case. read more

function

<?php   function replace_urls( $text = null ) {     $regex  = '/((http|ftp|https):\/\/)?[\w-]+(\.[\w-]+)+([\w.,@?^=%&amp;:\/~+#-]*[\w@?^=%&amp;\/~+#-])?/';     return preg_replace_callback( $regex, function( $m ) {       $link = $name = $m[0];       if ( empty( $m[1] ) ) {         $link = "http://".$link;       }       return '<a href="'.$link.'" target="_blank" rel="nofollow">'.$name.'</a>';     }, $text );   } ?>

usage

<?php   $text = "http://stackoverflow.com/questions/17854971/preg-replace-to-replace-string-for-matching-url#17855054   www.google.com   https://twitter.com/   http://www.somelinkwithhash.com/post/4454/?foo=bar#foo=bar";    echo replace_urls( $text ); ?>

output

<a href="http://stackoverflow.com/questions/17854971/preg-replace-to-replace-string-for-matching-url#17855054" target="_blank" rel="nofollow">http://stackoverflow.com/questions/17854971/preg-replace-to-replace-string-for-matching-url#17855054</a> <a href="http://www.google.com" target="_blank" rel="nofollow">www.google.com</a> <a href="https://twitter.com/" target="_blank" rel="nofollow">https://twitter.com/</a> <a href="http://www.somelinkwithhash.com/post/4454/?foo=bar#foo=bar" target="_blank" rel="nofollow">http://www.somelinkwithhash.com/post/4454/?foo=bar#foo=bar</a>

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