On Which Line Number Was the Regex Match Found?

Question

I would like to search a .java file using Regular Expressions and I wonder if there is a way to detect one what lines in the file the matches are found.

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Answer 1

There are no methods in Java that will do it for you. You must read the file line-by-line and check for a match on each line. You can keep an index of the lines as you read them and do whatever you want with that index when a match is found.