options() public

Returns the set of bits corresponding to the options used when creating this Regexp (see Regexp::new for details. Note that additional bits may be set in the returned options: these are used internally by the regular expression code. These extra bits are ignored if the options are passed to Regexp::new.

   Regexp::IGNORECASE                  #=> 1
   Regexp::EXTENDED                    #=> 2
   Regexp::MULTILINE                   #=> 4

   /cat/.options                       #=> 128
   /cat/ix.options                     #=> 131
   Regexp.new('cat', true).options     #=> 129
   Regexp.new('cat', 0, 's').options   #=> 384

   r = /cat/ix
   Regexp.new(r.source, r.options)     #=> /cat/ix
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