How to replace multiple patterns with RegExp-CodePudding

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?

CodePudding user response：

You don't need regex for this, you can use replaceAll method and replace all spaces with '':

String phoneStr = " 41 000 0000 000";
phoneStr = phoneStr.replaceAll(' ', '');
print(phoneStr); // 410000000000

CodePudding user response：

You can use

String flattenPhoneNumber(String phoneStr) {
    return phoneStr.replaceAll(RegExp(r'(?!^\ )\D'), '');
}

The following

print(flattenPhoneNumber(" 41 000 0000 000"));

prints 410000000000.

See the regex demo. The (?!^\ )\D pattern matches any non-digit char (\D) that is not equal to at the start of the string.

CodePudding user response：

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] == " " ? " " : "";
    });
}