Regex replace, maximum length and unicode support

Question

I am using

    fs = Regex.Replace(s, ss, sr);

 

In s: ????(4 non english characters)

In ss: ?(.{1,2})?

In sr: ??

 

The problem is, it needs (.{1,6}) instead of (.{1,2}) to replace it.

 

How do I get something like '\p{L}' into that regex.replace so that each letter from any language is a single length?

 

 EDIT: how do I get this form to support non english characters?