c# - Pad left with zeroes

Question

I want to pad left every number with zeroes (it has to be 8 digits) in my string.

e.g.

asd 123 rete > asd 00000123 rete
4444 my text > 00004444 my text

Is it possible to do this using regular expressions? Especially Regex.Replace()?

Notice that the number of zeroes is different for different numbers. I mean the padded number has to be 8 digits long.

Answer 1

Microsoft has built in functions for this:

someString = someString.PadLeft(8, '0');

And here's an article on MSDN

To use a regular expression, do something like this:

string someText = "asd 123 rete"; 
someText = Regex.Replace(someText, @"d+", n => n.Value.PadLeft(8, '0'));