How to remove all text but the last 3 characters

Question

I want to remove all text except the last 3 characters. So, for example if I have:

783223748foo
blahblahI\'m
sfdhello

It should become:

Answer 1

You may try the following find and replace:

Find:

^.*(?=.{3}$)$

Replace:

(empty string)

The pattern ^.*(?=.{3}$)$ matches the entire line, but will then pause before consuming the final three characters in the line. The lookahead (?=.{3}$) ensures that the final three characters will not be replaced.