3v4l.org

run code in 300+ PHP versions simultaneously
<?php $strings = [ 'one"two_"_"_three', 'one__two_"__three', 'one__two_"__""____"three', 'one__two___"""""""______three', ]; var_export( preg_replace('~["_]+~', '_', $strings) );
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array ( 0 => 'one_two_three', 1 => 'one_two_three', 2 => 'one_two_three', 3 => 'one_two_three', )
preferences:
100.81 ms | 1502 KiB | 4 Q