you can use the standard find/replace in any GUI or text editor. I personally prefer vi (or vim in some cases) its a rather simple syntax:
Give a skeptic and inch... and he'll take a mile.
:s/take a mile/measure it/
I would be left with
Give a skeptic and inch... and he'll measure it.
that is what you would do on the line you want to edit, now if you want to make this a global add a g at the end of the command:
:s/take a mile/measure it/g