How to replace multiple patterns with RegExp

Question

I have phone numbers like +41 000 0000 000 and currently I only can keep + sign with my code but I also need to remove spaces from this numbers.

Here is my current function

String flattenPhoneNumber(String phoneStr) {
    return phoneStr.replaceAllMapped(RegExp(r'^(\+)|D'), (Match m) {
      return m[0] == "+" ? "+" : "";
    });
}

How can I remove spaces as well as keeping my + signs?

Answer 1

Solved

I've changed my code to following and its working as it supposed to:

String flattenPhoneNumber(String phoneStr) {
    return phoneStr.replaceAll(' ', '').replaceAllMapped(RegExp(r'^(\+)|D'), (Match m) {
      return m[0] == "+" ? "+" : "";
    });
}