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<?php preg_match("(&[^;]*(*SKIP)(*F)|um)", "R&auml;ume", $m); var_dump($m);
Output for 4.4.9, 5.2.5 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(2) "um" }
Output for 5.2.0 - 5.2.4
Warning: preg_match(): Compilation failed: nothing to repeat at offset 7 in /in/fT5H0 on line 3 NULL
Output for 4.3.11 - 4.4.8, 5.0.0 - 5.1.6
Warning: preg_match(): Compilation failed: nothing to repeat at offset 7 in /in/fT5H0 on line 3 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: nothing to repeat at offset 7 in /in/fT5H0 on line 3 array(0) { }