matching multiple regexs to a single line...

[Trent Mick]

> On Tue, 12 Nov 2002 15:18:01 +0000, John Hunter wrote:
> > That's what I usually end up doing
> > 
> > for line in myfile:
> >   m = r1.match(line)
> >   if m:
> >     do_something()
> >     break
> > 
> >   m = r2.match(line)
> >   if m:
> >     do_something_else()
> >     break
> >   
> > 

[Alexander Sendzimir wrote]
> Thanks for your response. This is what I was afraid of. This seems really
> sloppy. You don't think there is any better way of doing such a thing? In
> the mean time, what you propose is exactly what I've been doing. Hmmmm.

A slight mod on John's code makes it seem pretty clean to me:

patterns = [re.compile('...'),
            re.compile('...')]

    for line in myfile:
        for pattern in patterns:
            match = pattern.match(line)
            if match:
                // do something with 'match'
                break
        else:
            raise "none of the patterns matched"

This scales well for adding more patterns. I usually use named groups in
my Python regexs so the single "do something" block for matching any of
the patterns works itself out.


> ... because I haven't been able to get
> Python to make an assignment in an if-statement. In other words,
> 
> if ( myMatch = re1.match( line ) ) :
>     ...
> elif ( myMatch = re2.match( line ) ) :
>     ...
> 
> doesn't work for me. Perhaps I've missed something simple.

No, you didn't miss anything. You cannot use assignment in the test part
of a Python if-statement.


Trent

-- 
Trent Mick
TrentM at ActiveState.com