Question

Given a string

 var testData = "1234 test string 987 more test";

I want to be able to use a regex to pull out 1234 and 987. As far as I could tell using

 var reg = new Regex(@"?<numbers>\d+");

should do what I want but when I say

 var match = reg.match(testData);

I would think that

 Assert.AreEqual(match.Groups["numbers"].Captures.Count(), 2);

but it’s only 1. What am I doing wrong? Intuition tells me that the

 ?<group> 

means there can only be 0 or 1 of these values. Should I not be using a named group?

 *<group> 

doesn’t seem to work in the regex builder in visual studio but I did not try it in my tests.

Answer 1

Why didn’t you use the pattern string as below:

Regex reg = new Regex(@"\d+");

and then get the numbers by:

MatchCollection matches = reg.Matches(testData);

After that, the matches variable contains 2 Match value which represent for 1234 and 987.

You also use the assert as:

Assert.AreEqual(matches.Count, 2);

Hope it will help you!