Cucumber::RbSupport::RegexpArgumentMatcher

    # File lib/cucumber/rb_support/regexp_argument_matcher.rb, line 6
 6:       def self.arguments_from(regexp, step_name)
 7:         match = regexp.match(step_name)
 8:         if match
 9:           n = 0
10:           match.captures.map do |val|
11:             n += 1
12:             start = match.offset(n)[0]
13:             StepArgument.new(val, start)
14:           end
15:         else
16:           nil
17:         end
18:       end