“No match Found” when using matcher's group method

Question

I\'m using Pattern/Matcher to get the response code in an HTTP response. groupCount returns 1, but I get an exception when trying to g

Answer 1

You are constantly overwriting the matches you got by using

System.out.println(responseCodePattern.matcher(firstHeader).matches());
System.out.println(responseCodePattern.matcher(firstHeader).groupCount());

Each line creates a new Matcher object.

You should go

Matcher matcher = responseCodePattern.matcher(firstHeader);
System.out.println(matcher.matches());
System.out.println(matcher.groupCount());