Add space per 4 characters with RegEx

Question

What is the RegEx to put whitespace per 4 characters

For example I have an IBAN number like this

BE45898287271283

I want to format it like this

BE45 8982 8727 1283

Any help is appreciated.

Answer 1

You can try this

string test = "BE45898287271283";
test = Regex.Replace(test, ".{4}", "$0 ").Trim();

Answer 2

Using a RegEx;

foo = Regex.Replace(foo, ".{4}", "$0 ");

Answer 3

private string Group4(string s)
{
    string output="";
    for(int i=0; i < s.Length; i+=4)
        output+=s.Substring(i, 4) + ' ';

    return s.TrimEnd();
}

Answer 4

Try this regex instead:

[a-z\d]{4}

string in="BE45898287271283";
string out = Regex.Replace("(?i)([a-z\\d]{4})", "$1 ");