fix nested captured groups indexing in replace stage #3381
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adityacs
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What this PR does / why we need it:
If there is a nested captured group ex:
(?P<ip_user>^(?P<ip>\\S+) (?P<identd>\\S+) (?P<user>\\S+))and log line11.11.11.11 - frank,FindAllStringSubmatchIndexwould return the matched index list[[0 19 0 19 0 11 12 13 14 19]]. There is a complete match0-19and other submatches0-11, 12-13 .... This causedslice bounds out of rangeerror in the old code when concatenating the matched entry. This PR fixes this issue.Which issue(s) this PR fixes:
Fixes #3353
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