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FileRead, OutputVar, filein.txt
Sort, OutputVar, N
;--------------------------- Regex here.
FileAppend, %OutputVar%, fileout.txt

Loop, read, fileout.txt
{
   Pos := RegExMatch(A_LoopReadLine, """([^""]*)""", var)
   FileAppend, %var1%`n, tmp2.txt
}

read_me := A_Desktop . "\New Text Document.txt"
h_file := FileOpen(read_me, 3)

if isObject(h_file) {
   Loop {
      line := h_file.ReadLine()
      if % RegexMatch(line, "^\d")
         new_file .= line
   } Until h_file.AtEOF
}
else {
   MsgBox unable to read file
   ExitApp
}

Sort, new_file, N
;FileAppend new_file content here

file = New Text Document.txt
FileRead, OutputVar, %file%
Sort, OutputVar, N
FileAppend, %OutputVar%, tmp.txt
loop, read, tmp.txt
{
   StringLeft, int_check, A_LoopReadLine, 1
   if int_check is number
      ;FileAppend new_file content here
}