On 2006-11-08 Leandro Guimarães Faria Corcete DUTRA wrote:
> > > u.login REGEXP
> > > '^wa[bhkl][_[.period.]-acegmnopqrsuvwxyz]{1,5}[14Lt][23890IJOQ].*...
> > > But I get, among otherss, a string beginning with 'walt' (several, in
> > > fact).
> >
> > Probably MySQL don't know about this "[.period.]" thing and just takes the
> > "." in it
> > as "any char", e.g. your "t" from "walt".
>
> I got that from cname.h, mentioned in the MySQL regexp documentation.
>
> > Try '^wa[bhkl][-_acegmnopqrsuvwxyz]{1,5}[14Lt][23890IJOQ].*', if there is a
> > "-" at the
> > beginning of a character class it is usually threaten literally as it makes
> > no sense
> > as "from..to" separator in those cases.
>
> Hm, but I do need to take into account the period.
Right, the "[.period.]" really exists, so you can safly insert it. But only
*after*
this "-" character!
> Also, do you mean the - at the beginning will make all following
> characters be treated literally?
Hm, no, the "-" inside "[" and "]" is a special character, i.e. "[a-z]" means
all chars
from a to z. So in your case that would have been all chars from . to a which
makes not
much sense. If you write "[-az]" on the other hand that means the dash char or
a or z.
So just move the "-" right after the "[" and you're done.
"walt12" -> false
"wal.12" -> true
"wala12" -> true
bye,
-christian-
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