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run code in 150+ php & hhvm versions
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<?php $regex = "/(.*volume:\s+)([0-9]+)(%)/g"; $text = "volume: 90%"; preg_match($rexeg, $text, $matches); var_dump($matches);
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined variable: rexeg in /in/PEefX on line 4 Warning: preg_match(): Empty regular expression in /in/PEefX on line 4 NULL
Output for hhvm-3.10.0 - 3.12.0
Notice: Undefined variable: rexeg in /in/PEefX on line 4 Warning: Empty regular expression in /in/PEefX on line 4 NULL
Output for 5.0.4 - 5.1.6
Notice: Undefined variable: rexeg in /in/PEefX on line 4 Warning: preg_match(): Empty regular expression in /in/PEefX on line 4 array(0) { }
Output for 4.3.11 - 5.0.3
Notice: Undefined variable: rexeg in /in/PEefX on line 4 Warning: preg_match(): Empty regular expression in /in/PEefX on line 4 array(0) { }
Output for 4.3.0 - 4.3.10
Notice: Undefined variable: rexeg in /in/PEefX on line 4 Warning: Empty regular expression in /in/PEefX on line 4 array(0) { }