Issue in Regex match is C# greedy technique

Asked Feb 25 '20 at 13:09

Active Feb 25 '20 at 13:11

Viewed 38 times

I have doubt in below code which doesn't match regular expression:

 string strToCheck = "Rahul Chaudhary";
            Regex objAlphaPattern = new Regex("Rah* Chaudhary");
            if (objAlphaPattern.IsMatch(strToCheck)){
                Console.WriteLine(strToCheck);
            }

But, when i change

Regex objAlphaPattern = new Regex("Rah* Chaudhary");

Regex objAlphaPattern = new Regex("Rah*");

It works.

Please help me with regex to match the complete string, when my input is Rah* Chaudhary it should match Rahul Chaudhary.

Thanks.

asked Feb 25 '20 at 13:09

AllTech

1

`Rah* Chaudhary` is not a *regex*, it is a *wildcard* pattern. – Wiktor Stribiżew Feb 25 '20 at 13:11
1

Well, no, it is actually a regex. But probably not the expected one. – David Amar Feb 25 '20 at 13:13
1

Maybe you'r looking to use something along the lines of: `^Rah\S+\sChaudhary$` for just a single first name, or even `^Rah.*Chaudhary$` for multiple. – JvdV Feb 25 '20 at 13:16
1

`h*` looks for 0 or more `h` characters. If you want to search for any character, use `.*`. `"Rah.* Chaudhary"` works – Panagiotis Kanavos Feb 25 '20 at 13:16
Is there any way to search without using regex , i.e something similar to str.contains. – AllTech Feb 25 '20 at 14:08
Star means : previous char (here 'h' in your case) repeated as many times as possible. Dot means: any char Rah.* Chaudhary is the correct regex : it matches Rah, then any char repeated as many times as possible, then " Chaudhary" – David Amar Feb 25 '20 at 14:27
Thanks Rah.* works. – AllTech Feb 25 '20 at 14:29

Issue in Regex match is C# greedy technique

0 Answers0