Regex to compare strings with Umlaut and non-Umlaut variations

Question

Can anyone help me with a javascript regular expression that I can use to compare strings that are the same, taking into acccount their non-Umlaut-ed versions.

for e

Answer 1

I have another way : ( purpose : sorting arrays )

function umlaut(str) {
 return str
  .replace(/Â|À|Å|Ã/g, "A")
  .replace(/â|à|å|ã/g, "a")
  .replace(/Ä/g, "AE")
  .replace(/ä/g, "ae")
  .replace(/Ç/g, "C")
  .replace(/ç/g, "c")
  .replace(/É|Ê|È|Ë/g, "E")
  .replace(/é|ê|è|ë/g, "e")
  .replace(/Ó|Ô|Ò|Õ|Ø/g, "O")
  .replace(/ó|ô|ò|õ/g, "o")
  .replace(/Ö/g, "OE")
  .replace(/ö/g, "oe")
  .replace(/Š/g, "S")
  .replace(/š/g, "s")
  .replace(/ß/g, "ss")
  .replace(/Ú|Û|Ù/g, "U")
  .replace(/ú|û|ù/g, "u")
  .replace(/Ü/g, "UE")
  .replace(/ü/g, "ue")
  .replace(/Ý|Ÿ/g, "Y")
  .replace(/ý|ÿ/g, "y")
  .replace(/Ž/g, "Z")
  .replace(/ž/, "z"); 
}