Is this a regex bug?
rank1seeker at gmail.com
rank1seeker at gmail.com
Sun Jan 26 21:32:58 UTC 2014
> -n is being interpreted as an option to ‘echo’ and being swallowed before it gets to egrep.
>
> - Mark
I've tried without echo
printf "\-n\n" | egrep '^\-[[:alnum:]]+$'
This works!
Thanks for pointing out.
> Try without the grep:
>
> $ echo '-m'
> -m
> $ echo '-n'
> $ echo '-o'
> -o
> $ man echo
>
>
>
>
> On Jan 26, 2014, at 1:04 PM, rank1seeker at gmail.com wrote:
>
> > Or am I crazy?
> >
> > echo '-m' | egrep '^\-[[:alnum:]]+$'
> > echo '-n' | egrep '^\-[[:alnum:]]+$'
> > echo '-o' | egrep '^\-[[:alnum:]]+$'
> >
> > Guess what?
> > Only middle one, '-n' doesn't match it.
> > Is this an RE bug or I clearly ain't seeing obvious?!
> >
> > echo '-n' | egrep '^\-[0-9A-Za-z]+$'
> > Doesn't work either
> >
> > 9.2-RELEASE-p3 i386
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