Regular Expresion Error?

ruby-talk
1

Hello all,

According to the Regular Expressions section of the following ruby
guide: http://www.ruby-doc.org/docs/ProgrammingRuby/html/tut_stdtypes.html,
the piece of code bellow should have returned "He<<ll>>o", instead of
"No match". Has anyone got an idea on why it isn't working?

Notice that if I tell the interpreter how big \w should be in an
explicit way by adding {1,1}, the expected result is given.

def showRE(a,re)
  #re = Regexp.new(re) if re.class==String
  #re=Regexp.new(re.to_s) if re.class==Integer
  if a=~re
    "#{$`}<<#{$&}>>#{$'}"
  else
    "no match"
  end
end

puts showRE("Hello", /(\w)\1/) #=> no match
puts showRE("Hello", /(\w{1,1})\1/) #=> He<<ll>>o

Thanks in advance for helping

2

Forgot to mention: Im running ruby 1.8.6 at Mac OS X 10.4.

3

Filipe wrote:

def showRE(a,re)
  #re = Regexp.new(re) if re.class==String
  #re=Regexp.new(re.to_s) if re.class==Integer
  if a=~re
    "#{$`}<<#{$&}>>#{$'}"
  else
    "no match"
  end
end

puts showRE("Hello", /(\w)\1/) #=> no match
puts showRE("Hello", /(\w{1,1})\1/) #=> He<<ll>>o

Both return "He<<ll>>o" for me.
ruby 1.8.6 (2007-09-23 patchlevel 110) [x86_64-linux]

···

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4

Filipe wrote:

puts showRE("Hello", /(\w)\1/) #=> no match
puts showRE("Hello", /(\w{1,1})\1/) #=> He<<ll>>o

Both return "He<<ll>>o" on my machine too (Windows2000 -
OneClickInstaller 186-25).

Wolfgang Nádasi-Donner

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5

looks like the ruby interpreter I was running was jruby, under
netbeans. Unfourtunately, I didn't realize it at first.

···

On Sep 30, 5:52 am, "Wolfgang Nádasi-Donner" <ed.oda...@wonado.de> wrote:

Filipe wrote:
> puts showRE("Hello", /(\w)\1/) #=> no match
> puts showRE("Hello", /(\w{1,1})\1/) #=> He<<ll>>o

Both return "He<<ll>>o" on my machine too (Windows2000 -
OneClickInstaller 186-25).

Wolfgang Nádasi-Donner
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