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pos = 1
sentence = Test this sentence, okay?
done := strLen(sentence)
while (pos < done)
{
  pos := RegExMatch(sentence, "([a-zA-Z]+)", temp, %pos%)
  word%a_index% := temp1
  pos := pos + strLen(temp1)
  displayword := word%a_index%
  msgbox %pos%`n%temp1%`n%sentence%`n%displayword%
}

^x::ExitApp

sentence = Test this sentence, okay?
StringSplit, word, sentence, %A_Space%
Loop, %word0%
 MsgBox,% word%A_Index%

newsentence := RegexReplace(sentence, "\W+", " ")
StringSplit, word, newsentence, %A_Space%

#NoEnv
sentence = Test this sentence, okay?
pos = 1
counter = 0
While (pos := RegExMatch(sentence, "[a-zA-Z]+", temp, pos + StrLen(temp)))
{
  counter++
  word%a_index% := temp
  displayword := word%a_index%
  MsgBox Word: %counter%`nPosition: %pos%`n%temp%`n%sentence%`n%displayword%
}
ExitApp
^x::ExitApp