How to replace more than a space in a string with some special character in c#

Question

How to replace more than a space in a string with some special character in c#?

I have a string as

Hi I  am new  here. Would   you    please help    me?

I want output as

Hi I$am new$here. Would$you$please help$me?

I tried

string line=@"Hi I  am new  here. Would   you    please help    me?";
string line1 = Regex.Replace(line,@"[\s\s]+","$");
Console.WriteLine(line1);

but I am getting output as

Hi$I$am$new$here.$Would$you$please$help$me?

Could you please tell me where am I going wrong?

Answer 1

You should specify than you want more than two ({2,}) whitespace characters (\s):

string line1 = Regex.Replace(line,@"\s{2,}","$");

or only more than two spaces ([ ]):

string line1 = Regex.Replace(line,@"[ ]{2,}","$");

Note: [\s\s]+ means: one or more of character group specified in [], so as \s is doubled, it simply means: one or more of whitespace character.

Answer 2

You were not far from the correct solution. The simplest fix for your code is:

string line1 = Regex.Replace(line,@"\s\s+","$");

Answer 3

Try this regular expression

[\s]{2,}

which goes in the code as:

string line1 = Regex.Replace(line,@"[\s]{2,}","$");

Here is a rubular showing this