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This does the following:
1 - Search recursively for files whose names match REGEX_A
2 - From this list exclude files whose names match REGEX_B
3 - Open this as a group in textmate (in the sidebar)
And now you can use Command+Shift+F to use textmate own find and replace on this particular group of files.
For advanced regex in the first expression you can use -regextype posix-egrep like this:
mate - `find * -type f -regextype posix-egrep -regex 'REGEX_A' | grep -v -E 'REGEX_B'`
Warning: this is not ment to open files or folders with space os special characters in the filename. If anyone knows a solution to that, tell me so I can fix the line.