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add an example for Regexp.union document.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13642 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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@ -2056,6 +2056,7 @@ rb_reg_s_try_convert(VALUE dummy, VALUE re)
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* Regexp.union("penzance") #=> /penzance/
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* Regexp.union("a+b*c") #=> /a\+b\*c/
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* Regexp.union("skiing", "sledding") #=> /skiing|sledding/
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* Regexp.union(["skiing", "sledding"]) #=> /skiing|sledding/
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* Regexp.union(/dogs/, /cats/i) #=> /(?-mix:dogs)|(?i-mx:cats)/
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*/
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static VALUE
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