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run code in 300+ PHP versions simultaneously
<?php $text = "ABC01 ABC02 ABC03 ABC04 ABC05 ABC06 "; echo preg_replace( '/\R+(?=ABC04)/', ' - ', trim($text) );
Output for git.master, git.master_jit, rfc.property-hooks
ABC01 ABC02 ABC03 - ABC04 ABC05 ABC06

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