CODEWITHSUNDEEP
c#regex
user2250152
user2250152

Reputation: 20625

C# regex to extract string between two characters but first character has multiple occurences

I'm trying to extract string between two characters. First charachter has multiple occurences and I need the last occurence of first character. I've already checked similar questions but all suggested regexes don't work in case of multiple occurences of first character.

Example:

TEST-[1111]-20190603-25_TEST17083

My code:

string input = "TEST-[1111]-20190603-25_TEST17083";
var matches = Regex.Matches(input,@"(?<=-)(.+?)(?=_)");
var match = matches.OfType<Match>().FirstOrDefault();
var value = match.Groups[0].Value;

The current result:

[1111]-20190603-25

Expected result:

25

Upvotes: 2

Views: 373

Answers (2)

Mohammed Noureldin
Mohammed Noureldin

Reputation: 16806

One option to get your result (and there are many options of course) is the following pattern:

.*-([0-9]*)_

and then get the first matched group (group with Id 1).

So your code will look like this:

var input = "[1111]-20190603-25";
var pattern = @".*-([0-9]*)_";

var match = Regex.Match(input, pattern);
var value = match.Groups[1];

Upvotes: 2

Dmitrii Bychenko
Dmitrii Bychenko

Reputation: 186668

Let's try a bit different pattern: 

(?<=-)([^-_]+?)(?=_)

we use [^-_] instead of .: all characters except - and _

Upvotes: 4

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