Regular expressions help

[Mike Hearne]

Given the following three lines:

name fredgeorge
name georgeharry
name george

I'm trying to find a regular expression that matches only the third
one.

My book resources are pretty skimpy when it comes to regular
expressions, and the stuff on the web I've found doesn't cover this
circumstance, and I can't figure out how to extrapolate from what is
described to my problem.

Can anyone help?

Thanks!

[Andrei]

Re: Regular expressions help

Mike Hearne wrote on 24 Feb 2004 10:54:45 -0800:
[color=blue]
> Given the following three lines:
>
> name fredgeorge
> name georgeharry
> name george
>
> I'm trying to find a regular expression that matches only the third
> one.[/color]

It's pretty easy:

"name george$"

"$" means end of string

--
Yours,

Andrei

=====
Real contact info (decode with rot13):
cebwrpg5@jnanqb b.ay. Fcnz-serr! Cyrnfr qb abg hfr va choyvp cbfgf. V ernq
gur yvfg, fb gurer'f ab arrq gb PP.

[Bernard Delmée]

Re: Regular expressions help

> name fredgeorge[color=blue]
> name georgeharry
> name george
>
> I'm trying to find a regular expression that matches only the third
> one.[/color]

'name george' would do, then ?!? If you mean 'george' on its
own as opposed to the previous variants, that'd be r'\bgeorge\b'.
One nifty tool to learn and experiment with re's is the
tools/scripts/redemo.py script normally present in your python installation.

[Andrei]

Re: Regular expressions help

Bernard Delmée wrote on Tue, 24 Feb 2004 20:36:50 +0100:
[color=blue][color=green]
>> name fredgeorge
>> name georgeharry
>> name george
>>
>> I'm trying to find a regular expression that matches only the third
>> one.[/color]
>
> 'name george' would do, then ?!? If you mean 'george' on its[/color]

That one matches the "name george" part of "name georgeharry" as well,
which he didn't want.

--
Yours,

Andrei

=====
Real contact info (decode with rot13):
cebwrpg5@jnanqb b.ay. Fcnz-serr! Cyrnfr qb abg hfr va choyvp cbfgf. V ernq
gur yvfg, fb gurer'f ab arrq gb PP.

[Bernard Delmée]

Re: Regular expressions help

> That one matches the "name george" part of "name georgeharry" as well,[color=blue]
> which he didn't want.[/color]

Indeed; my bad. I mostly wanted to mention redemo, for which
the windows installer should create a shortcut, really...

[Mike C. Fletcher]

Re: Regular expressions help

Look in the module reference for REs, particularly the expression syntax
section:

http://www.python.org/doc/2.3.3/lib/re-syntax.html

You probably want either the $ or \b constructs. I'll let you decide
which is more appropriate for your task. You might alternately want the
(?! ... ) construct, but that's probably more complex than your needs.

HTH,
Mike

Mike Hearne wrote:
[color=blue]
>Given the following three lines:
>
>name fredgeorge
>name georgeharry
>name george
>
>I'm trying to find a regular expression that matches only the third
>one.
>
>[/color]
....
_______________ _______________ _________
Mike C. Fletcher
Designer, VR Plumber, Coder

http://members.rogers.com/mcfletch/

[Bernard Delmée]

Re: Regular expressions help

> That one matches the "name george" part of "name georgeharry" as well,[color=blue]
> which he didn't want.[/color]

Indeed; my bad. I mostly wanted to mention redemo, for which
the windows installer should create a shortcut, really...

[John Hazen]

Re: Regular expressions help

> Mike Hearne wrote on 24 Feb 2004 10:54:45 -0800:[color=blue]
>[color=green]
> > Given the following three lines:
> >
> > name fredgeorge
> > name georgeharry
> > name george
> >
> > I'm trying to find a regular expression that matches only the third
> > one.[/color][/color]

* Andrei <fake@fake.ne t> [2004-02-24 12:34]:[color=blue]
> It's pretty easy:
>
> "name george$"
>
> "$" means end of string[/color]

And if you'd also prefer not to match:

name name george

Then, you could match for:
"^name george$"

"^" means the beginning of the string.

-John
< my_first_name AT my_last_name DOT net >

[Marcello Pietrobon]

Re: Regular expressions help

Bernard Delmée wrote:
[color=blue][color=green]
>> That one matches the "name george" part of "name georgeharry" as well,
>> which he didn't want.[/color]
>
>
> Indeed; my bad. I mostly wanted to mention redemo, for which
> the windows installer should create a shortcut, really...
>[/color]
Agreed