This regular expression `rege(x(es)?|xps?)` matches strings that contain the word "regex", "regexes", "regexp", or "regexps". Let's break it down:

- `rege` matches the literal string "rege" at the beginning.

- `(x(es)?|xps?)` is a group that matches either:

 - `x` followed by an optional `es`, so it matches "regex" and "regexes".

 - `x` followed by `ps`, so it matches "regexp" and "regexps".

In summary, the regular expression matches variations of the word "regex", including "regex", "regexes", "regexp", and "regexps".