From: "list. rb" <list.rb@...>
Date: 2007-05-16T18:31:39+09:00
Subject: Re: how to determine if a string is printable?

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probably not exactly what you're looking for but I use this quite often for
white space removal:
" a".strip.empty?

On 5/16/07, Michael W. Ryder <_mwryder@worldnet.att.net> wrote:
>
> Bill Kelly wrote:
> > From: "Michael W. Ryder" <_mwryder@worldnet.att.net>
> >> Bill Kelly wrote:
> >>>
> >>> Based on:
> >>> http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/248540
> >>>
> >>> To test for non-printable characters, use:
> >>>
> >>>  str =~ /[^[:print:]]/
> >>>
> >> Even though I am not the OP I tried that and using index but none of
> >> them seem to work.  I get an error message saying "warning character
> >> class has '[' without escape" followed by "warning regexp has ']'
> >> without escape" and the return is nil regardless what is in the string.
> >> Is there something I am missing here?
> >
> > Not sure.  It works for me, without warnings even with ruby -w on:
> > ruby 1.8.4 (2005-12-24) [i386-mswin32]
> >
> > And in IRB:
> >
> > irb(main):117:0> "abc\ndef" =~ /[^[:print:]]/
> > => 3   # yes, a non-printable character was found at idx 3
> >
> > irb(main):118:0> "abcdef" =~ /[^[:print:]]/
> > => nil  # no, a non-printable character was not found
> >
> >
>
> OK, I see what I did.  I forgot the trailing colon.  Still getting used
> to the language and regular expressions.
>
> > Regards,
> >
> > Bill
> >
> >
> >
>
>

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