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<?php $regex = '/foo(bar(*SKIP)(*FAIL)|.*)$/'; var_dump(preg_match($regex, 'foobar')); var_dump(preg_match($regex, 'foobat'));
Output for 4.4.9, 5.2.5 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(0) int(1)
Output for 5.2.3 - 5.2.4
Warning: preg_match(): Compilation failed: nothing to repeat at offset 8 in /in/XpZCF on line 5 bool(false) Warning: preg_match(): Compilation failed: nothing to repeat at offset 8 in /in/XpZCF on line 6 bool(false)
Output for 4.4.3 - 4.4.8, 5.0.0 - 5.2.2
<br /> <b>Warning</b>: preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Compilation failed: nothing to repeat at offset 8 in <b>/in/XpZCF</b> on line <b>5</b><br /> bool(false) <br /> <b>Warning</b>: preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Compilation failed: nothing to repeat at offset 8 in <b>/in/XpZCF</b> on line <b>6</b><br /> bool(false)
Output for 4.3.11 - 4.4.2
<br /> <b>Warning</b>: preg_match(): Compilation failed: nothing to repeat at offset 8 in <b>/in/XpZCF</b> on line <b>5</b><br /> bool(false) <br /> <b>Warning</b>: preg_match(): Compilation failed: nothing to repeat at offset 8 in <b>/in/XpZCF</b> on line <b>6</b><br /> bool(false)
Output for 4.3.0 - 4.3.10
<br /> <b>Warning</b>: Compilation failed: nothing to repeat at offset 8 in <b>/in/XpZCF</b> on line <b>5</b><br /> bool(false) <br /> <b>Warning</b>: Compilation failed: nothing to repeat at offset 8 in <b>/in/XpZCF</b> on line <b>6</b><br /> bool(false)