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

[Pierre Gaston]

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:]]))}