[SOLVED] stringregexp, how do I refer to the start and end of the string?

$sTest1 = 'bErtrTRtrtXa'
$sTest2 = 'ErtrTRtrtX'
$sPattern = 'E[A-Za-z]{0,}X'
Local $iResult1 = StringRegExp($sTest1, $sPattern)
Local $iResult2 = StringRegExp($sTest2, $sPattern)
ConsoleWrite('Test 1: ' & $iResult1 & @CRLF & 'Test 2: ' & $iResult2)