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run code in 200+ php & hhvm versions
Bugs & Features
<?php $str = 'SH CH AKHALSDJOA'; echo mb_ereg_replace('[^CS]H', '', $str);
based on gRZjH
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0alpha1
SH CH AALSDJOA