mathiasbynens/Modernizr — comment on commit c0b9620605e29e69b2513be05533aaaf1682093f
File:  line 0
By jdalton:

By spec [RegExp#test](http://es5.github.com/#x15.10.6.3) is calling `RegExp#exec]` anyways so it's not really ignoring the capture group *(It still goes into processing)*. I usually am just explicite with my intentions for a regexp so devs reading it know I really DO or DON'T want a capture group. *(`[21]` is not a capture group but a character class)*.