Ruby regex key search
I think that using any?
is a good solution as stated by qqbenq, but I would prefer using it with grep
since it's more succinct.
hash.keys.grep(/regexp/).any?
I would advise extending Hash
with a new method instead of replacing has_key?
.
class Hash
def has_rkey?(search)
search = Regexp.new(search.to_s) unless search.is_a?(Regexp)
!!keys.detect{ |key| key =~ search }
end
end
This will work with strings, symbols or a regexp as arguments.
irb> h = {:test => 1}
=> {:test=>1}
irb> h.has_rkey?(:te)
=> true
irb> h.has_rkey?("te")
=> true
irb> h.has_rkey?(/te/)
=> true
irb> h.has_rkey?("foo")
=> false
irb> h.has_rkey?(:foo)
=> false
irb> h.has_rkey?(/foo/)
=> false