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run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = "LF5RF3RF3RF75"; echo preg_replace("/([FLR]\d*)/", "$1-", $a);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.1
L-F5-R-F3-R-F3-R-F75-