Regexp#fixed_encoding?

fixed_encoding? → true or false

static VALUE
rb_reg_fixed_encoding_p(VALUE re)
{
    return RBOOL(FL_TEST(re, KCODE_FIXED));
}

Returns false if self is applicable to a string with any ASCII-compatible encoding; otherwise returns true:

Example

r = /a/                                          # => /a/
r.fixed_encoding?                               # => false
r.match?("\u{6666} a")                          # => true
r.match?("\xa1\xa2 a".force_encoding("euc-jp")) # => true
r.match?("abc".force_encoding("euc-jp"))        # => true

r = /a/u                                        # => /a/
r.fixed_encoding?                               # => true
r.match?("\u{6666} a")                          # => true
r.match?("\xa1\xa2".force_encoding("euc-jp"))   # Raises exception.
r.match?("abc".force_encoding("euc-jp"))        # => true

r = /\u{6666}/                                  # => /\u{6666}/
r.fixed_encoding?                               # => true
r.encoding                                      # => #<Encoding:UTF-8>
r.match?("\u{6666} a")                          # => true
r.match?("\xa1\xa2".force_encoding("euc-jp"))   # Raises exception.
r.match?("abc".force_encoding("euc-jp"))        # => false

See also #eql? #hash #encoding #inspect also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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