VB.NET function to replace space with a rule

I am looking for following vb.net function (C# code is also fine)

 Convert a string with following rule
   Replace all single space with _
    Trim all the double or more spaces (Still _ should replace the first space )

E.x  My Single space  should become My_Single_Space
       My  DoubleSpace    turns to  My_DoubleSpace       ( Even though there are two spaces, only one _)
       My   TripleSpace singlespace      turns to My_TripleSpace_SingleSpace
Sam OZAsked:
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pls try
s = Regex.Replace(s, " {1,}", "_")

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s = Regex.Replace(s, "\s+", "_")

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do not forget
Imports System.Text.RegularExpressions

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ste5anSenior DeveloperCommented:
Homework, eh? Did you get the obvious test in the test?

Describe in your words first, what you need to implement.
käµfm³d 👽Commented:
s = Regex.Replace(s, "\s+", "_")
That replaces more than just spaces.
@kaufmed that's why I gave both options didn't know author's definition
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Visual Basic.NET

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