Feature/#293 regular exp operator

[ziflex]

• =~ positive matching
• !~ negative matching

[3timeslazy]

What about flags e.g.

• g (global) - don't return after first match
• m (multiline) - ^ and $ match start/end of line
• i (insensitive) - case insensitive match
• u (ungreedy) - make quantifiers lazy
  ?

[codecov]

Codecov Report

Merging #326 into master will decrease coverage by 0.3%.
The diff coverage is 36.5%.

@@           Coverage Diff            @@
##           master    #326     +/-   ##
========================================
- Coverage    39.8%   39.5%   -0.3%     
========================================
  Files         215     216      +1     
  Lines        8513    8698    +185     
========================================
+ Hits         3384    3433     +49     
- Misses       4775    4907    +132     
- Partials      354     358      +4

[ziflex]

What about flags e.g.

• g (global) - don't return after first match
• m (multiline) - ^ and $ match start/end of line
• i (insensitive) - case insensitive match
• u (ungreedy) - make quantifiers lazy
  ?

It supports everything that is supported by Regexp.MatchString.