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class method
OptionParser::Completion.regexp
regexp(key, icase)
lib/optparse.rb
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# File tmp/rubies/ruby-3.3.0/lib/optparse.rb, line 441
def self.regexp(key, icase)
Regexp.new('\A' + Regexp.quote(key).gsub(/\w+\b/, '\&\w*'), icase)
end
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