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<?php $str = "<div> <h3><mytag>_THIS_DAY</mytag></h3> <div> [LOGIN] </div> </div>"; $newStr = preg_replace("~(?<=<mytag>)[^>]+(?=</mytag>)~", "independance day", $str); echo $newStr;
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<div> <h3><mytag>independance day</mytag></h3> <div> [LOGIN] </div> </div>