Question

Input :

Hello my name is X. Blah Blah Blah

EDIT 1: Any user can enter his name substituted with X. So X is a variable with variable lenght.

Required Output :

Hello my name is Ahmed
Where X = Ahmed

Pattern :

(Hello my name is .+)\.

Really, this’s a newbie question 🙁 ,, I just start learning.
Not Working !

Answer 1

I really have no clue what your pattern is attempting to accomplish, so I will start at the beginning. What you want to do is to match Hello my name is X. We can do that like so.

/Hello my name is X\./

But we don’t want to capture the letter X, we want to match what would be in X’s place. So now our regex becomes.

/Hello my name is .+\./

So the former regex now matches any character one or more times. Now we want to capture that and use it outside of the regex. We can do this with the capture, (), operator.

/Hello my name is (.+)\./

Now the question is, “How do we get the capture?” Well Regex.Match returns a Match. Now Match has a property called Groups which is a collection of all the captures from the regex. So our final, code is.

var match = Regex.Match("Hello my name is dunsmoreb.", @"Hello my name is (.+)\.");
Console.WriteLine(match.Groups[1]); // Prints `dunsmoreb`.