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run code in 150+ php & hhvm versions
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<?php preg_match("/(^\b+|\s+\w+)/", "Ručné náradie",$matches); print_r($matches); echo "\n"; preg_match("/(\w*)/", "",$matches); print_r($matches);
Output for 5.2.0 - 7.1.0
Warning: preg_match(): Compilation failed: nothing to repeat at offset 4 in /in/9P4ae on line 2 Array ( [0] => [1] => )
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Compilation failed: nothing to repeat at offset 4 in /in/9P4ae on line 2 Array ( ) Array ( [0] => [1] => )
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: nothing to repeat at offset 4 in /in/9P4ae on line 2 Array ( ) Array ( [0] => [1] => )