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<?php $allowed = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; $input = 'abc-def'; $validLen = strspn($input, $allowed); if (strlen($input) !== $validLen) { printf('Input invalid, starting at %s', substr($input, $validLen)); } else { echo 'Input is valid'; }
Output for git.master, git.master_jit, rfc.property-hooks
Input invalid, starting at -def

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