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<?php $str = 'RANDOMWORD-123'; var_dump(preg_match('/^[a-zA-Z0-9\s--]+$/', $str));
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Warning: preg_match(): Compilation failed: invalid range in character class at offset 13 in /in/42BcG on line 4 bool(false)
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34
int(1)

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