3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $blogPostWord = 'http://youtu.be/O7Lm3BMG8ow'; preg_match('(?<=(?:v|i)=)[a-zA-Z0-9-]+(?=&)|(?<=(?:v|i)\/)[^&\n]+|(?<=embed\/)[^"&\n]+|(?<=‌​(?:v|i)=)[^&\n]+|(?<=youtu.be\/)[^&\n]+', $blogPostWord, $matches); var_dump($matches);
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Unknown modifier '[' in /in/9DNHa on line 4 NULL
Output for hhvm-3.10.0 - 3.12.0
Warning: Unknown modifier '[': [(?<=(?:v|i)=)[a-zA-Z0-9-]+(?=&)|(?<=(?:v|i)\/)[^&\n]+|(?<=embed\/)[^"&\n]+|(?<=‌​(?:v|i)=)[^&\n]+|(?<=youtu.be\/)[^&\n]+] in /in/9DNHa on line 4 NULL
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Unknown modifier '[' in /in/9DNHa on line 4 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '[' in /in/9DNHa on line 4 array(0) { }