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Thanks, it worked!

Sorry, a correction.
I have to match all lines having the words 'Current configuration' only at the beginning of the line.

Then in Pattern.matches(regExp, line), what must be the regExp?
regExp...

I have to match all lines having the words 'Current configuration' anywhere in the line(beginning/end/middle)

Then in Pattern.matches(regExp, line), what must be the regExp?
regExp = "^Current...