Reference:rubocop/rubocop#8327 andrubocop/rubocop#10082

The follow pairs have equivalent behaviour:

array.select{ |x|x.match?(REGEXP)}array.grep(REGEXP)array.reject{ |x|x.match?(REGEXP)}array.grep_v(REGEXP)

Previous to ruby 3,grep/grep_v had worse performance, but this was fixed byhttps://bugs.ruby-lang.org/issues/17030, so as of ruby 3,grep could be prefered as it is simpler.