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StringMod(string, method, param1 = "", param2 = "") {
   If method = Only ; remove all characters not in param1 from string:
      new := RegExReplace(string, "i)[^" . param1 . "]")
   Else If method = Omit ; remove characters in param1 from string:
      new := RegExReplace(string, "i)[" . param1 . "]")
   Else If method = Flip ; flip string backwards:
      Loop, % length := StrLen(string) ; loop for the length of the string
         new .= SubStr(string, length - A_Index, 1) ; get character from the end going backwards
   Else If method = Replace ; replace param1 with param2
      new := RegExReplace(string, "i)" . param1, param2)
   Else If RegExMatch(method, "Rot(?:ate)?(\d+)", rotN) ; for Rot13 and Rot47:
   {
      Loop, Parse, string ; for each character in the string:
         new .= Chr((chr := Asc(A_LoopField)) + rotN1) - 94 * (chr > 126)) ; apply rotation transformation
            ; this increases the ASCII value of the character by the specified rotation amount
            ; if the value exceeds 126 (highest character) subtract by 94 (character range)
   }
   Else If method = Scramble ; rearrange characters in random order
   {
      new := RegExReplace(string, "(.)", "$1÷") ; delimit each character with '÷'
      ; this high-ASCII character is unlikely to exist in string, if it does it will be removed
      Sort, new, Random Z D÷ ; randomly sort
      new := RegExReplace(new, "÷") ; remove delimiter
   }
   Else If method = Bloat ; pad each character with param1 and param2:
      new := RegExReplace(string, "(.)", param1 . "$1" . param2)
   Else If method = Pattern ; return the number of times each character appears in the string:
   {
      unique := RegExReplace(string, "(.)", "$1÷") ; delimit each character with '÷' (like in 'Scramble')
      Sort, unique, U Z D÷ ; remove duplicates
      unique := RegExReplace(unique, "÷") ; remove delimiter
      Loop, Parse, unique ; for each unique character in the string:
      {
         StringReplace, string, string, %A_LoopField%, , UseErrorLevel ; get the number of replacements
         new .= A_LoopField . ErrorLevel ; store this alongside the character itself
      }
   }
   Return, new ; return the modified string
}

StringMod.ahk (14) : ==> Missing "("