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<?php var_dump(preg_replace("/^[^a-zA-Z]+|[!#$%&'* +/=?^\`{\|\}\~]+/", "",'_(32jkashdfkj$#!!&&')); var_dump( preg_replace( '|[^a-z0-9_.\-@]|i', '', '_(32jkashdfkj$#!!&&' ));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace(): Unknown modifier '=' in /in/l7JOm on line 2 NULL string(12) "_32jkashdfkj"

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