Recursive find and replace text in Linux files?

Question

linux

Is there any Debian package for the subject?

Answer 1

find . -type f -name '*.py' -exec sed -i -r 's/regexp/new_replacement/g' {} \;

Will replace in all *.py files starting from the current directory the regexp line with new_replacement. (you can use regexp expressions)
Live example:

Answer 2

When manually confirming each replacement is critical, there is a good GUI tool: regexxer.sourceforge.net/
deb package is:sudo aptitude install regexxer