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<?php $s = '123_abc____def'; var_dump( preg_replace_callback( '/\_+[a-zA-Z]{1}/e', function($matches){return '_' . strtoupper($matches[1]);}, $s) );
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace_callback(): The /e modifier is no longer supported, use preg_replace_callback instead in /in/68U8V on line 6 NULL

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