3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_match('#<(link)(\s[^>]*|)>#i', '<link>', $matches));var_dump($matches); var_dump(preg_match('#<(link)(\s[^>]*|)>#i', '<link/>', $matches));var_dump($matches); var_dump(preg_match('#<(link)(\s[^>]*|)>#i', '<link rel=test>', $matches));var_dump($matches); var_dump(preg_match('#<(link)(\s[^>]*)?>#i', '<link>', $matches));var_dump($matches); var_dump(preg_match('#<(link)(\s[^>]*)?>#i', '<link/>', $matches));var_dump($matches); var_dump(preg_match('#<(link)(\s[^>]*)?>#i', '<link rel=test>', $matches));var_dump($matches);
based on tW04L
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
int(1) array(3) { [0]=> string(6) "<link>" [1]=> string(4) "link" [2]=> string(0) "" } int(0) array(0) { } int(1) array(3) { [0]=> string(15) "<link rel=test>" [1]=> string(4) "link" [2]=> string(9) " rel=test" } int(1) array(2) { [0]=> string(6) "<link>" [1]=> string(4) "link" } int(0) array(0) { } int(1) array(3) { [0]=> string(15) "<link rel=test>" [1]=> string(4) "link" [2]=> string(9) " rel=test" }