find and replace help

I have about 1500 sets of coordinates that I need to modify. I have a list that looks like this:
Z = 126.102 mm,
Z = 126.182 mm,
Z = 126.187 mm,
Z = 126.202 mm,I would like to find them and replace them all with the same value
Z = 126.000 mm,
Very new user and short on time and struggling with the expression. Can also use a find from Z = to a specific column, all the values are lined up.
Any help would be greatly appreciated.

what I get is that you only want to modify the decimal part, correct?
If so, and if your data look exactly like you posted thanfind: \.\d+ replace: .000
. means you are looking for the literal dot followed by
\d+ one or more digits (as much as possible)Of course you need to check the regular expression box in find repalce dialog.
Cheers
Claudia