From: Jason Roelofs <jameskilton@...>
Date: 2007-06-11T22:41:13+09:00
Subject: Re: why gsub! doesn't work in my script

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Backslash ( \ ) is the escape character. If you want to match \ itself, you
need to escape it ( \\ ). So try these regex's:

r1_obj=Regexp.escape('1.000000\\$P1G\\1.000000') #pattern
r2_obj=Regexp.escape('2.000000\\$P1G\\2.000000') #replacement

Jason

On 6/11/07, Li Chen <chen_li3@yahoo.com> wrote:
>
> Hi all,
>
> I want to search one pattern  in a file line by line and replace it with
> new  pattern one. But it doesn't work. I cannot change the old pattern
> into the new one using gsub! Is there any problem with my script?
>
> Thanks,
>
> Li
>
>
>
>
> ################Ruby script##############
>
> #create a regular expression  and its replacement
>
> r1_obj=Regexp.escape('1.000000\$P1G\1.000000') #pattern
> r2_obj=Regexp.escape('2.000000\$P1G\2.000000') #replacement
>
>
> DATA.each_line do |line|
>           if line.match(r1_obj)
>                 line.gsub!(r1_obj, r2_obj)     #
>                 puts line
>           end
> end
>
>
>
>
> __END__
>
> test1.001
> K:\flow\test\test1.001
> xxx\1.000000\$P1G\1.000000\xxx
> yyyy\1.000000\$P1G\1.000000\xxx
> test1.002
> K:\flow\test\test1.002
> xxx\1.000000\$P1G\1.000000\xxx
> yyyy\1.000000\$P1G\1.000000\xxx
> test1.003
> K:\flow\test\test1.003
> xxx\1.000000\$P1G\1.000000\xxx
> yyyy\1.000000\$P1G\1.000000\xxx
>
> ####screen output###########
>
> xxx\1.000000\$P1G\1.000000\xxx
> yyyy\1.000000\$P1G\1.000000\xxx
> xxx\1.000000\$P1G\1.000000\xxx
> yyyy\1.000000\$P1G\1.000000\xxx
> xxx\1.000000\$P1G\1.000000\xxx
> yyyy\1.000000\$P1G\1.000000\xxx
>
> --
> Posted via http://www.ruby-forum.com/.
>
>

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