regex doubts

MRAB google at mrabarnett.plus.com
Sat Jul 19 16:35:55 EDT 2008


On Jul 19, 9:12 pm, John Machin <sjmac... at lexicon.net> wrote:
> On Jul 20, 5:04 am, Fredrik Lundh <fred... at pythonware.com> wrote:
>
> > Mr SZ wrote:
> > > I am taking a string as an input from the user and it should only
> > > contain the chars:L , M or R
>
> > > I tried the folllowing in kodos but they are still not perfect:
>
> > > [^A-K,^N-Q,^S-Z,^0-9]
> > > [L][M][R]
> > > [LRM]?L?[LRM]? etc but they do not exactly meet what I need.
>
> > > For eg: LRLRLRLRLM is ok but LRLRLRNL is not as it has 'N' .like that.
>
> > try "[LRM]+$" (an L or an R or an M, one or more times, all the way to
> > the end of the string).
>
> Ummm ... with the default flag settings, shouldn't that be \Z instead
> of $
> ?

$ means end of string unless the multiline flag is used, in which case
it means end of line.

\Z always means end of string.

Similar remarks apply to ^ and \A.



More information about the Python-list mailing list