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<?php $str = 'RANDOMWORD-123'; var_dump(preg_match('/^[a-zA-Z0-9\s--]+$/', $str));
Output for git.master_jit, git.master, rfc.property-hooks
Warning: preg_match(): Compilation failed: invalid range in character class at offset 13 in /in/42BcG on line 4 bool(false)

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