在Regex中发生了什么匹配

Question

Let's imagine i have some regex pattern:

(a)|(b)|(c)

How to identify what match has been triggered? Is there some kind of index of match?

I can check all groups for null or compare global Value field with group Value fields or separate pattern to many and check them through line of " if ", but its kinda crappy and gives additional complexity. Is regex don't have some finite state value?

Answer 1

Sure you can do this:

match.Groups[1].Success // true or false
match.Groups[2].Success // true or false
match.Groups[3].Success // true or false

You could also name your groups to make it easier to follow:

(?<foo>a)|(?<bar>b)|(?<baz>c)

match.Groups["foo"].Success // true or false
match.Groups["bar"].Success // true or false
match.Groups["baz"].Success // true or false