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End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Regexp#encoding

obj.encoding → encoding

Returns the Encoding object that represents the encoding of obj.

See also #casefold? #eql? #as_json #fixed_encoding? also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0