#include <Array.au3>
$sStr = 'Test string' & @CRLF & 'Next string'
$timer1 = TimerInit()
For $i = 1 To 1000
$aArr = StringRegExp($sStr, '(?s).', 3)
Next
$timer1 = Round(TimerDiff($timer1), 2)
$timer2 = TimerInit()
For $i = 1 To 1000
$aArr = StringSplit($sStr, '', 2)
Next
$timer2 = Round(TimerDiff($timer2), 2)
MsgBox(0, "Время выполнения", '$timer1 = ' & $timer1 & ' мсек' & @LF & '$timer2 = ' & $timer2)
; _ArrayDisplay($aArr)