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<?php $someString = "abcABC!!!ABCabc"; echo strtolower(preg_replace("/[^a-zA-Z]/", "", $someString)); echo "\n\n\n"; $tmp = strtolower($someString); echo preg_replace("/[^a-zA-Z]/", "", $tmp);
Output for rfc.property-hooks, git.master, git.master_jit
abcabcabcabc abcabcabcabc

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