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Regex: help needed on backreferences for nested capturing groups

763890Mar 10 2010 — edited Mar 10 2010

Hello, everyone

I'm confused with backreferences for the nested capturing group(s). Can anyone help me out to understand it?
Well, I knew that the following regular expression would match any 2 digits, followed by the exact same two digits:

(\d\d)\1

BUT, how about a nested capturing group? How would it be evaluated?

(\d\d(confused))\2

In the expression (\d\d(\d)), there are two groups:
1.itself, (\d\d(confused))
2.nested group, (confused)

And, *\2* here specifies that is the second pattern (confused) that I want to use for matching? Urr.... totally confused.

Edited by: Jay-K on Mar 10, 2010 3:39 PM

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