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run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_replace('/(\\\'){2,}|(\\"){2,}/', '$1', "te'\"\"'st"));
based on XkGGv
Output for 4.3.0 - 7.1.7, 7.2.0 - 7.3.0rc4
string(6) "te''st"
Output for 7.1.10

Process exited with code 137.