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run code in 150+ php & hhvm versions
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<?php echo preg_replace('@amazon\.com.*?"@g','cao','<a target="_blank" href="http://www.amazon.com/dp/B005LA53LA/?tag={tag}">');
Output for 4.3.11 - 5.6.21, 7.0.0 - 7.1.0
Warning: preg_replace(): Unknown modifier 'g' in /in/Udihn on line 2
Output for hhvm-3.10.0 - 3.12.0
Warning: Unknown modifier 'g': [@amazon\.com.*?"@g] in /in/Udihn on line 2
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'g' in /in/Udihn on line 2