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<?php $string = 'bla bla bla http://google.com bla bla'; $fixedString = preg_replace_callback( '#[-a-zA-Z0-9@:%_\+.~\#?&//=]{2,256}\.[a-z]{2,4}\b(\/[-a-zA-Z0-9@:%_\+.~\#?&//=]*)?#si', function($matches) { return 'http://exmaple.com/visit/' . base64_encode($matches[0]); }, $string ); var_dump($fixedString);
Output for git.master, git.master_jit, rfc.property-hooks
string(69) "bla bla bla http://exmaple.com/visit/aHR0cDovL2dvb2dsZS5jb20= bla bla"

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