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This is a programmer tool mainly, because the find-replace rules are regular expressions in .NET flavor. It also has an *ix like grep and unique capability. More complex cases could be solved writing the MatchEvaluator method used in string Replace(string input, MatchEvaluator evaluator) call.

This new tool RegExpTool unifies RegExpEditor and RegExpFileRenamer, offering find-replace rules expressed as regular expressions (.NET flavor). The editor part has grep, unique, sort and grouping capabilities. Files are renamed in two steps, first a preview is loaded in a table (manual changes permitted), the actual renaming will start only if proposed names are accepted.
More complex situations could be handled writing the MatchEvaluator method used in
string Replace(string input, MatchEvaluator evaluator) call.