Capturing Groups REGEX Java

Question

I'd like to capture the groups in my regular expression but it seems that I haven't written it as it should be. Consider the following lines:

String input = "username=johndoe";
Pattern pattern = Pattern.compile("(\\w+)=(\\w+)");
Matcher matcher = pattern.matcher(input);

When I try to capture the group one and two I've got an IllegalStateExcpetion. I really don't know what's wrong with my regex, and I also tried several different ways of writing it =/.

Thanks in advance for your help.

score 2 · Answer 1 · answered May 03 '14 at 16:52

2

You are getting IllegalStateExcpetion because you forgot to call either:

matcher.matches()

OR

matcher.find()

You can access captured groups only after calls to either of the 2 methods shown above.

answered May 03 '14 at 16:52

anubhava

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score 0 · Accepted Answer · answered May 03 '14 at 16:54

0

You need to do find or matches :

matcher.matches() or matcher.find()

answered May 03 '14 at 16:54

Rakesh KR

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Capturing Groups REGEX Java

2 Answers2