preg_replace() [function.preg-replace]: Unknown modifier '/' in /home/

Question

in my website i want to replace links with some other link like this

www.abc.com or http://abc.com will be replaced with

http:/

Answer 1

"/\[url]www|http://.([^'\"]*)\[\/url]/iU",
 ^               ^^                  ^

You either need to escape the two // in the middle to \/\/, or, better, use different delimiters for the regex:

"~\[url]www|http://.([^'\"]*)\[/url]~iU",

Answer 2

There is few ways to solve that

Escaping "/"

$search_array = array(
  "/\[url]www|http:\/\/.([^'\"]*)\[\/url]/iU",
  "/\[url]([^'\"]*)\[\/url]/iU",
  "/\[url=www|http:\/\/.([^'\"\s]*)](.*)\[\/url]/iU",
  "/\[url=([^'\"\s]*)](.*)\[\/url]/iU"
);

Or using different regexp seperator like "#"

$search_array = array(
  "#\[url]www|http://.([^'\"]*)\[\/url]#iU",
  "#\[url]([^'\"]*)\[\/url]#iU",
  "#\[url=www|http://.([^'\"\s]*)](.*)\[\/url]#iU",
  "#\[url=([^'\"\s]*)](.*)\[\/url]#iU"
);