Bash command for regular expression substitution
Solution 1:
You probably want
sed 's/exp1/exp2/g' foo.txt > foo2.txt
Read more at Sed tutorial, Another tutorial, and A small tutorial at Linux HOWTOs
Solution 2:
You can also use perl one liners if you find you want more regular expression features than sed provides. See this link for a comparison. nik's example would look like:
perl -ple 's/exp1/exp2/g' foo > foo2.txt
Solution 3:
The program you are looking for is sed.