JRuby to support \K escape sequence in 9.1.15.0

Allow me to celebrate the JRuby team (and nearby efforts) in that the next patch release of it will include \K as a regular expression special character.

This GitHub Issue was just closed with a resolution in the Joni library: https://github.com/jruby/jruby/issues/4871

Its support is in a little select company, randomly listed at StackOverflow, which has such google-juice that it felt worth it to shout about JRuby on there.

I’ll repeat the example from the GitHub Issue:

$ irb
2.3.1 :001 > 'street'.match( /s\Kt/)
 => #<MatchData "t"> 

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