From: "Thairuby ->a, b {a + b}" <kabkab@...>
Date: 2009-09-28T01:54:25+09:00
Subject: Re: handling of regexp objects that aren't referenced by variables,  arrays, tables or objects

Is this ok? But it still use variable :(

file.each_line { |line|
  if line =~ (a ||= $line_patterns["pattern a"])
    process_pattern_a(line)
  elsif line =~ (b ||= $line_patterns["pattern b"])
    process_pattern_b(line)
  # some more elsifs
  end
}
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