#include <String.au3>
$text = "<easyAudioPlayer>easy Audio Player what's new?</easyAudioPlayer><easyAudioPlayerUpdate>Update version 3.0.0</EasyAudioPlayerUpdate>"
msgBox(0, "", StringBetween($text, "<easyAudioPlayer>", "</easyAudioPlayer>"))
Func StringBetween($sString, $sStart, $sEnd)
    Local $sReturn
    $sReturn = _StringBetween($sString, $sStart, $sEnd)
    If @error Then Return ''
    Return $sReturn[0]
EndFunc