Find/Replace everything up to X
Find *X
Replace X

Find/Replace everything after X
Find X*
Replace X

Find/Replace everything up to X and everything after Y
Do a two part Find/Replace, as above

Find/Replade everytning up to first occurence of X and
first occurence of Y
This one would require VBA.

Find multiple occurences of X
And replace? Then simply Find X and Replace.

Bernie