From: "Mauricio Fernández" <batsman.geo@...>
Date: 2003-05-26T16:12:17+09:00
Subject: Re: Modified "showRE" anomalies

On Mon, May 26, 2003 at 03:18:10PM +0900, Richard wrote:
> I modified "showRE" demonstrated in the online version of Programming
> Ruby.  My purpose was to have what struck me as a more convenient way
> of analyzing the nuances of Ruby's implementation of Regular
> Expressions. My mod is:
> 
> def applyRE(a,re)  
>   if a =~ re  
>     puts "Val '#{a}', Pat '#{re}' ==>  #{$`}<<#{$&}>>#{$'}"  
>   else  
>     puts "Val '#{a}', Pat '#{re}' ==>  no match"  
>   end  
> end  
> 
> v1 = '12.34'
> p1 = '/^\d*\.?/'
> 
> applyRE(v1, /^\d*\.?/)	# Val '12.34', Pat '#<Regexp:0x2a6aa68>' ==> 
> <<12.>>34
> applyRE(v1, p1)		# Val '12.34', Pat '/^\d*\.?/' ==>  no match


batsman@tux-chan:/tmp$ expand -t2 al.rb
def applyRE(a,re)
  if a =~ re
    puts "Val '#{a}', Pat '#{re.source}' ==>  #{$`}<<#{$&}>>#{$'}"
  else
    puts "Val '#{a}', Pat '#{re.source}' ==>  no match"
  end
end

v1 = '12.34'
p1 = /^\d*\.?/   # this a Regexp not a String!

applyRE(v1, /^\d*\.?/)
applyRE(v1, p1)
batsman@tux-chan:/tmp$ /usr/bin/ruby -v
ruby 1.6.8 (2002-12-24) [i386-linux]
batsman@tux-chan:/tmp$ /usr/bin/ruby al.rb
Val '12.34', Pat '^\d*\.?' ==>  <<12.>>34
Val '12.34', Pat '^\d*\.?' ==>  <<12.>>34

batsman@tux-chan:/tmp$ expand -t2 ak.rb
def applyRE(a,re)
  if a =~ re
    puts "Val '#{a}', Pat '#{re}' ==>  #{$`}<<#{$&}>>#{$'}"
  else
    puts "Val '#{a}', Pat '#{re}' ==>  no match"
  end
end

v1 = '12.34'
p1 = /^\d*\.?/

applyRE(v1, /^\d*\.?/)
applyRE(v1, p1)
batsman@tux-chan:/tmp$ ruby -v
ruby 1.8.0 (2003-03-03) [i686-linux]
batsman@tux-chan:/tmp$ ruby ak.rb
Val '12.34', Pat '(?-mix:^\d*\.?)' ==>  <<12.>>34
Val '12.34', Pat '(?-mix:^\d*\.?)' ==>  <<12.>>34


Regexp#to_s has changed. 

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