Is this a regex bug?

[Tim Kientzle]

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
> 
> 
> Domagoj Smolčić
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