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<?php $text = "This is a text with some@email.com an e-mail address in it"; echo preg_replace_callback( '~[\w.-]+@(?:[\w-]+\.)+\w+~', function($m) { return "**{$m[0]}**"; }, $text );
Output for git.master, git.master_jit, rfc.property-hooks
This is a text with **some@email.com** an e-mail address in it

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