Add a unit test for regular expressions
Add a unit test for regular expressions

We do not really support regular expressions yet, but we do support
trivial patterns including ones with escaped characters. Let's make sure
that that works as advertised.

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

marcinolawski/avian,dicej/avian,ucdseniordesign/avian,MaartenR/avian,joshuawarner32/avian,dicej/avian,bigfatbrowncat/avian-pack.avian,MaartenR/avian,lostdj/avian,getlantern/avian,bgould/avian,marcinolawski/avian,joshuawarner32/avian,lostdj/avian,getlantern/avian,lwahlmeier/avian,joshuawarner32/avian,ucdseniordesign/avian,lwahlmeier/avian,lostdj/avian,ucdseniordesign/avian,minor-jason/avian,getlantern/avian,ucdseniordesign/avian,marcinolawski/avian,joshuawarner32/avian,marcinolawski/avian,lostdj/avian,bigfatbrowncat/avian-pack.avian,bgould/avian,bgould/avian,minor-jason/avian,lwahlmeier/avian,dicej/avian,MaartenR/avian,bigfatbrowncat/avian-pack.avian,bigfatbrowncat/avian-pack.avian,minor-jason/avian,dicej/avian,bgould/avian,lwahlmeier/avian,getlantern/avian,MaartenR/avian,minor-jason/avian