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<?php echo preg_replace( '/(^|[a-z])([A-Z])/e', 'strtolower(strlen("\\1") ? "\\1_\\2" : "\\2")', $word );
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $word in /in/Q5U5J on line 5 Deprecated: preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /in/Q5U5J on line 2 Warning: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead in /in/Q5U5J on line 2

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