Regular Exp

[afds]

If I want to match $.58 in $.589922 How do I do it with Regular Expressions?
[color=blue][color=green][color=darkred]
>>> s=re.search("\$ \.[0-9]{2}", "$.589922")
>>> s.string[/color][/color][/color]
'$.589922'
and not
'$.58' which i s what I want
I think it has something to do with Greediness right?

[Ben Finney]

Re: Regular Exp

On Fri, 31 Oct 2003 08:11:39 GMT, afds wrote:[color=blue]
> If I want to match $.58 in $.589922 How do I do it with Regular Expressions?
>[color=green][color=darkred]
> >>> s=re.search("\$ \.[0-9]{2}", "$.589922")
> >>> s.string[/color][/color]
> '$.589922'[/color]

Yes. The 'string' member of a MatchObject returns the entire string
that was passed to the search() that produced it, as the docs will tell
you:

<http://www.python.org/doc/current/lib/match-objects.html#l2 h-875>
[color=blue]
> and not
> '$.58' which i s what I want[/color]

You need to define one or more groups within the expression, grouping
what you want to access. Then use 'MatchObject.gr oup()' to access one
group at a time or 'MatchObject.gr oups()' to access all of them as a
tuple:
[color=blue][color=green][color=darkred]
>>> s = re.search( "(\$\.[0-9]{2})", "$.589922" )
>>> s.group(1)[/color][/color][/color]
'$.58'[color=blue][color=green][color=darkred]
>>> s.groups()[/color][/color][/color]
('$.58',)[color=blue][color=green][color=darkred]
>>>[/color][/color][/color]

--
\ "I used to be a proofreader for a skywriting company." -- |
`\ Steven Wright |
_o__) |
Ben Finney <http://bignose.squidly .org/>

[Ben Finney]

Re: Regular Exp

On 31 Oct 2003 19:29:14 +1050, Ben Finney wrote:[color=blue]
> You need to define one or more groups within the expression, grouping
> what you want to access. Then use 'MatchObject.gr oup()' to access one[/color]

Or, as Harvey pointed out, use 'MatchObject.gr oup(0)' to access the
entire matching portion of the string, without needing to explicitly
define groups.

--
\ "Any sufficiently advanced bug is indistinguishab le from a |
`\ feature." -- Rich Kulawiec |
_o__) |
Ben Finney <http://bignose.squidly .org/>

[afds]

Re: Regular Exp

Ah, so you're saying my Regular Expression is correct? It just matches for
two digits?

"Ben Finney" <bignose-hates-spam@and-benfinney-does-too.id.au> wrote in
message news:slrnbq49du .107.bignose-hates-spam@rose.local domain.fake...[color=blue]
> On 31 Oct 2003 19:29:14 +1050, Ben Finney wrote:[color=green]
> > You need to define one or more groups within the expression, grouping
> > what you want to access. Then use 'MatchObject.gr oup()' to access one[/color]
>
> Or, as Harvey pointed out, use 'MatchObject.gr oup(0)' to access the
> entire matching portion of the string, without needing to explicitly
> define groups.
>
> --
> \ "Any sufficiently advanced bug is indistinguishab le from a |
> `\ feature." -- Rich Kulawiec |
> _o__) |
> Ben Finney <http://bignose.squidly .org/>[/color]

[afds]

Re: Regular Exp

Damn didn't see Harvey's message, ignore.
[color=blue]
> Ah, so you're saying my Regular Expression is correct? It just matches[/color]
for[color=blue]
> two digits?
>
> "Ben Finney" <bignose-hates-spam@and-benfinney-does-too.id.au> wrote in
> message news:slrnbq49du .107.bignose-hates-spam@rose.local domain.fake...[color=green]
> > On 31 Oct 2003 19:29:14 +1050, Ben Finney wrote:[color=darkred]
> > > You need to define one or more groups within the expression, grouping
> > > what you want to access. Then use 'MatchObject.gr oup()' to access one[/color]
> >
> > Or, as Harvey pointed out, use 'MatchObject.gr oup(0)' to access the
> > entire matching portion of the string, without needing to explicitly
> > define groups.
> >
> > --
> > \ "Any sufficiently advanced bug is indistinguishab le from a |
> > `\ feature." -- Rich Kulawiec |
> > _o__) |
> > Ben Finney <http://bignose.squidly .org/>[/color]
>
>[/color]