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Printf with backreference in ruby

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Old 08-31-2013
Printf with backreference in ruby
Hello everybody,

May you help with this, I don't know what is wrong.

I want trying to print the first 4 characters as decimal and remove the "k's" from the next 7 characters.

I'm trying with gsub and backrefence as shown below trying to remove the "k's" and then trying to assign to "x" the 0x0020
using the backreference of pattern1, but is not working.


What I've tried:
Code:
string = "0020aakbbjk30294748"

string=string.gsub!(/(\d{4})([a-z]{7})((\d){5})/,'k')

x="0x"+"#{$1}"

printf("%d ",$x) 
puts "#{$2} #{$3}"

desired output:
Code:
32 aabbj 30294

Thanks in advance for any help.
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irb

IRB(1)							 Ruby Programmers Reference Guide						    IRB(1)

NAME

     irb -- Interactive Ruby Shell

SYNOPSIS

     irb [--version] [-dfm] [-I directory] [-r library] [--[no]inspect] [--[no]readline] [--prompt mode] [--prompt-mode mode] [--inf-ruby-mode]
	 [--simple-prompt] [--noprompt] [--tracer] [--back-trace-limit n] [--irb_debug n] [--] [program_file] [argument ...]

DESCRIPTION

     irb is the REPL(read-eval-print loop) environment for Ruby programs.

OPTIONS

     --version	    Prints the version of irb.

     -E external[:internal]
     --encoding external[:internal]
		    Same as `ruby -E' .  Specifies the default value(s) for external encodings and internal encoding. Values should be separated
		    with colon (:).

		    You can omit the one for internal encodings, then the value (Encoding.default_internal) will be nil.

     -I path	    Same as `ruby -I' .  Specifies $LOAD_PATH directory

     -U 	    Same as `ruby -U' .  Sets the default value for internal encodings (Encoding.default_internal) to UTF-8.

     -d 	    Same as `ruby -d' .  Sets $DEBUG to true.

     -f 	    Suppresses read of ~/.irbrc.

     -h
     --help	    Prints a summary of the options.

     -m 	    Bc mode (load mathn, fraction or matrix are available)

     -r library     Same as `ruby -r'.	Causes irb to load the library using require.

     --inspect	    Uses `inspect' for output (default except for bc mode)

     --noinspect    Doesn't use inspect for output

     --readline     Uses Readline extension module.

     --noreadline   Doesn't use Readline extension module.

     --prompt mode
     --prompt-mode mode
		    Switch prompt mode. Pre-defined prompt modes are `default', `simple', `xmp' and `inf-ruby'.

     --inf-ruby-mode
		    Uses prompt appropriate for inf-ruby-mode on emacs.  Suppresses --readline.

     --simple-prompt
		    Makes prompts simple.

     --noprompt     No prompt mode.

     --tracer	    Displays trace for each execution of commands.

     --back-trace-limit n
		    Displays backtrace top n and tail n.  The default value is 16.

     --irb_debug n  Sets internal debug level to n (not for popular use)

ENVIRONMENT

     IRBRC

     Also irb depends on same variables as ruby(1).

FILES

     ~/.irbrc	     Personal irb initialization.

EXAMPLES

	   % irb
	   irb(main):001:0> 1 + 1
	   2
	   irb(main):002:0> def t(x)
	   irb(main):003:1> x+1
	   irb(main):004:1> end
	   => nil
	   irb(main):005:0> t(3)
	   => 4
	   irb(main):006:0> if t(3) == 4
	   irb(main):007:1> p :ok
	   irb(main):008:1> end
	   :ok
	   => :ok
	   irb(main):009:0> quit
	   %

SEE ALSO

     ruby(1).

REPORTING BUGS

     Security vulnerabilities should be reported via an email to <security@ruby-lang.org>.  Reported problems will be published after being fixed.

     And you can report other bugs and feature requests via the Ruby Issue Tracking System (http://bugs.ruby-lang.org).  Do not report security
     vulnerabilities via the system because it publishes the vulnerabilities immediately.

AUTHORS

     Written by Keiju ISHITSUKA.

UNIX
								 November 7, 2012							      UNIX