Re: [Help-bash] ${var//!([[:class:]])} removing characters of the [:class:]

[Mart Frauenlob]

On 27.01.2013 09:31, Pierre Gaston wrote:
> On Sun, Jan 27, 2013 at 10:07 AM, Mart Frauenlob
> <address@hidden> > x=abc
> > $ echo "${x/!([[:alpha:]])}"
> >
> > $ echo "${x/[![:alpha:]]}"
> > abc
> >
> > still why does the first example remove all alphabetic chars, there can't be
> > a match???
>
> because inside [[:alpha:]] only matches 1 character
> so abc is not match by alpha since it is 3 character, abc is the
> longest string that doesn't match and it removed
> you get abc with:
>   x=abc;echo ${x/!(+([[:alpha:]]))}

thank you very much for that explanation!

have a nice day