Regex to first occurrence only?

Andy E and Ipsquiggle have the right idea, but I want to point out that you might want to add a word boundary assertion, meaning you don't want to deal with words that have "this" or "test" in them-- only the words by themselves. In Perl and similar that's done with the "\b" marker.

As it is, this(.*?)test would match "thistles are the greatest", which you probably don't want.

The pattern you want is something like this: \bthis\b(.*?)\btest\b

The regex is greedy meaning it will capture as many characters as it can which fall into the .* match. To make it non-greedy try:

this(.*?)test

The ? modifier will make it capture as few characters as possible in the match.