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<?php $word = "word,!pineapple--pizza"; $revd = preg_replace_callback('#([A-Za-z]+)#', 'rev_first', $word); function rev_first($matches){ return strrev($matches[1]); } var_dump($revd);
Output for git.master, git.master_jit, rfc.property-hooks
string(22) "drow,!elppaenip--azzip"

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