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run code in 150+ php & hhvm versions
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<?php $street = 'Hans-Wurst-Stra├če 1/2'; $streetNo = '1/2'; var_dump(preg_match('/('.$streetNo.')$/i', $street));
based on nmGj2
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Unknown modifier '2' in /in/m7l3O on line 6 bool(false)
Output for hhvm-3.10.0 - 3.12.0
Warning: Unknown modifier '2': [/(1/2)$/i] in /in/m7l3O on line 6 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '2' in /in/m7l3O on line 6 bool(false)