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<?php $text = "[img]http://www.test.com/ abc.jpg[/img]"; $uid = 123; $text = preg_replace_callback( "#\[img]((?:https?|ftps?)://[^?&=\#\"<]*?\.(?:jpe?g|gif|png))\[/img]#i", function ($m) use ($uid) { return "[img:$uid]" . str_replace(' ', '%20', $m[1]) . "[/img:$uid]"; }, $text ); echo $text;
Output for git.master_jit, git.master, rfc.property-hooks
[img:123]http://www.test.com/%20%20abc.jpg[/img:123]

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