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<?php $string = "($a * 10 + $b) Euro and (10 + 2) cents"; $regex = '#\((([^()]+|(?R))*)\)#'; if (preg_match_all($regex, $string ,$matches)) { echo var_export($matches[1], true); } else { //no parenthesis echo $string; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Undefined variable $a in /in/taQYB on line 2 Warning: Undefined variable $b in /in/taQYB on line 2 array ( 0 => ' * 10 + ', 1 => '10 + 2', )
Output for 5.0.4 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: a in /in/taQYB on line 2 Notice: Undefined variable: b in /in/taQYB on line 2 array ( 0 => ' * 10 + ', 1 => '10 + 2', )
Output for 7.3.32 - 7.3.33
array ( 0 => ' * 10 + ', 1 => '10 + 2', )
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
Notice: Undefined variable: a in /in/taQYB on line 2 Notice: Undefined variable: b in /in/taQYB on line 2 array ( 0 => ' * 10 + ', 1 => '10 + 2', )

preferences:
227.94 ms | 402 KiB | 322 Q