Fix PHP warnings "preg_replace(): [...] invalid range in character class"

Fix PHP warnings "preg_replace(): [...] invalid range in character class"

This was spotted when running tests on Travis (PHP 7.3 nighly, trusty).

Two expressions inside preg_replace() contained non-escaped "-" inside [],
where this "-" meant an actual "-" character.
The warning is because "-" has special meaning inside [] ("a-z" for range),
and things like [\w-.] are considered "invalid range".

Solution is to escape "-" like this: [\w\-.]

Change-Id: I41cc217081f00f54d957b6d8052ee209412f5ff6
(cherry picked from commit d88e924b6e5a7d529c471980e14f72430a94e546)