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run code in 150+ php & hhvm versions
Bugs & Features
<?php print preg_replace("((?:&[^;]*(*SKIP)(*FAIL))um)", "R&auml;ume", "__");
Output for 4.4.9, 5.2.5 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
__
Output for 4.3.11 - 4.4.8, 5.0.0 - 5.2.4
Warning: preg_replace(): Compilation failed: nothing to repeat at offset 10 in /in/sIOEd on line 3
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: nothing to repeat at offset 10 in /in/sIOEd on line 3