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<?php preg_match('/(^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}(,{1}[\w-\.]+@([\w-]+\.)+[\w-]{2,4})*$)|^$/', "foo");
Output for git.master, git.master_jit
Warning: preg_match(): Compilation failed: invalid range in character class at offset 5 in /in/lW4dQ on line 3

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