From: Robert Klemme <bob.news@...>
Date: 2005-03-21T21:04:50+09:00
Subject: Re: string.tr and \


"Tom Counsell" <tamc2@cam.ac.uk> schrieb im Newsbeitrag
news:193f68dcbb7799e1110cab8eb7a02248@cam.ac.uk...
> Hello
>
> I'm a little confused and would appreciate your help.  I would like to
> remove any \ characters from a string as well as some other characters.
>
> 'b\\c['.tr('\\','') # => 'bc', which is great.
>
> 'b\\c'.tr('\\c','.') # => 'b\\' which is not great.
>
> Why does adding extra characters to the tr function stop the removal of
> \ characters?

Note also

>> 'b\\c'.tr('c\\','.')
=> "b.."

You're abusing String#tr - this method is intended to replace single chars
by other single chars.  That you can remove characters is a special case
with empty replacement strings.  You really should be using gsub or gsub!:

>> 'b\\c'.gsub /\\/, ''
=> "bc"

Kind regards

    robert