替换字符串所在行

String=字符串
FileRead,File,%A_ScriptDir%Text.txt
Loop,10
  {
    line=
    Loop Parse, File, `n
      {
        If (A_loopfield ~=String)
          {
            LineNum := A_Index
            Break
          }
      }
    Loop Parse, File, `n
      {
        If (A_Index = LineNum)
            line .= "替换`n"
        Else
            line .= A_Loopfield . "`n"
      }
    StringTrimRight, File, line, 1
  }
MsgBox, % File