Answer / kp

private void RegExp(string input)
{
string s = input;
Regex regexp = new Regex("^[0-9]*_[A-Za-z]*$");
if(regexp.IsMatch(input))
Console.WriteLine("Matched");
else
Console.WriteLine("Not Match");
}

Answer / raghuram

both the above answers are wrong....... Reg Exp should say..

new Regex("[0-9]*_[A-Za-z]*");

^ and $ mean beginning and end of a line... and the question
is to select that particular combination no matter where
they are present...... need not be entire line.

Answer / thanvir

private void RegExp(string input)
{
string s = input;
Regex regexp = new Regex("^[0-9]*_[A-Za-z]*$");
if(regexp.IsMatch(input))
Console.WriteLine("Matched");
else
Console.WriteLine("Not Match");
}

Answer / pio

Raghuram is right and his regex is 100% correct. The other
2 answers also have a string which does nothing:

string s = input;

so it is not necessary.

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