From: Joao Silva <rubyforum@...>
Date: 2009-08-23T19:21:37+09:00
Subject: Re: [array & regexp] Development - works, production not - why?

Ok, here is my test.rb:

class String
  def include_regexp?
    if /\A\/.*\/[iomx]*\Z/.match(self)
      true
    else
      false
    end
  end

  def to_regexp
    return Regexp.new(self) unless 
self.strip.match(/\A\/(.*)\/(.*)\Z/mx)
    regexp , flags = $1 , $2
    return nil if !regexp || flags =~ /[^xim]/m

    x = /x/.match(flags) && Regexp::EXTENDED
    i = /i/.match(flags) && Regexp::IGNORECASE
    m = /m/.match(flags) && Regexp::MULTILINE

    Regexp.new regexp , [x,i,m].inject(0){|a,f| f ? a+f : a }
  end
end

def negative_terms_regexp(negative_terms)
  buffer = []
  negative_terms.split(',').each do |term|
    term.strip!
    if term.include_regexp?
      buffer << term.to_regexp
    else
      if term.include?('*') || term.include?('?')
        buffer << term.gsub("?", ".").gsub("*", ".*").to_regexp
      else
        buffer << Regexp.new(term)
      end
    end
  end
  Regexp.union(buffer.uniq)
end

puts negative_terms_regexp("term, term2, termx")
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