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<?php $strings = [ "This is a word", "<-#word#->", "<-#<-#<-#word#->#->#->", ]; $p = "word"; foreach ($strings as $string) { $string = preg_replace("/(?<!<-#)($p)(?!#->)/i", '<-#$1#->', $string); echo $string . PHP_EOL; }
Output for git.master, git.master_jit, rfc.property-hooks
This is a <-#word#-> <-#word#-> <-#<-#<-#word#->#->#->

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