From: 7stud -- <bbxx789_05ss@...>
Date: 2009-08-23T20:12:01+09:00
Subject: Re: [array & regexp] Development - works, production not - w

Joao Silva wrote:
>
> This may be ruby bug?
>

Nope.

$ ruby -v
ruby 1.8.6 (2007-03-13 patchlevel 0) [i686-darwin8.11.1]

$ ri Regexp.union

---------------------------------------------------------- Regexp::union
     Regexp.union([pattern]*)   => new_str
------------------------------------------------------------------------
     Return a +Regexp+ object that is the union of the given _pattern_s,
     i.e., will match any of its parts. The _pattern_s can be Regexp
     objects, in which case their options will be preserved, or Strings.
     If no arguments are given, returns +/(?!)/+.

        Regexp.union                         #=> /(?!)/
        Regexp.union("penzance")             #=> /penzance/
        Regexp.union("skiing", "sledding")   #=> /skiing|sledding/
        Regexp.union(/dogs/, /cats/i)        #=> 
/(?-mix:dogs)|(?i-mx:cats)/

------------------------


arr = [/term/, /term2/, /termx/]
puts Regexp.union(*arr)

--output:--
(?-mix:(?-mix:term)|(?-mix:term2)|(?-mix:termx))


You should also be able to use that code in ruby 1.8.7 if Regexp.union 
has the same definition in ruby 1.9:


$ri19 Regexp.union
---------------------------------------------------------- Regexp::union
     Regexp.union(pat1, pat2, ...)            => new_regexp
     Regexp.union(pats_ary)                   => new_regexp

     From Ruby 1.9.1
------------------------------------------------------------------------
     Return a +Regexp+ object that is the union of the given _pattern_s,
     i.e., will match any of its parts. The _pattern_s can be Regexp
     objects, in which case their options will be preserved, or Strings.
     If no patterns are given, returns +/(?!)/+.

        Regexp.union                         #=> /(?!)/
        Regexp.union("penzance")             #=> /penzance/
        Regexp.union("a+b*c")                #=> /a+b*c/
        Regexp.union("skiing", "sledding")   #=> /skiing|sledding/
        Regexp.union(["skiing", "sledding"]) #=> /skiing|sledding/
        Regexp.union(/dogs/, /cats/i)        #=> 
/(?-mix:dogs)|(?i-mx:cats)/




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