Gabriel Genellina wrote:
> En Wed, 14 Feb 2007 01:07:33 -0300, John Nagle <[EMAIL PROTECTED]>
> escribió:
>
>> Here's a large Perl regular expression, from a Perl address parser in
>> CPAN:
>>
>> use re 'eval';
>> $Addr_Match{street} = qr/
>> (?:
>> # special case for addresses like 100 South Street
>> (?:($Addr_Match{direct})\W+ (?{ $_{street} = $^N })
>> ($Addr_Match{type})\b (?{ $_{type} = $^N }))
>> |
>> (?:($Addr_Match{direct})\W+ (?{ $_{prefix} = $^N }))?
>> (?:
>> ([^,]+) (?{ $_{street} = $^N })
>> (?:[^\w,]+($Addr_Match{type})\b (?{ $_{type} = $^N }))
>> (?:[^\w,]+($Addr_Match{direct})\b (?{ $_{suffix} = $^N
>> }))?
>> |
>> ([^,]*\d) (?{ $_{street} = $^N })
>> ($Addr_Match{direct})\b (?{ $_{suffix} = $^N })
>> |
>> ([^,]+?) (?{ $_{street} = $^N })
>> (?:[^\w,]+($Addr_Match{type})\b (?{ $_{type} = $^N }))?
>> (?:[^\w,]+($Addr_Match{direct})\b (?{ $_{suffix} = $^N
>> }))?
>> )
>> )
>> /ix;
>>
>> I'm trying to convert this to Python.
>>
>> Those entries like "$(Addr_Match{direct}) are other regular expressions,
>> being used here as subexpressions. Those have already been converted
>> to forms like "Addr_Match.direct" in Python. But how to call them?
>> Is that possible in Python, and if so, where is it documented?
>
>
> That would be string interpolation, like this:
>
> Addr_Match = {"direct": "some_re_string",
> "type": "other_re"
> }
>
> regexp = "%(direct)s %(type)s" % Addr_Match
You're right. I looked at the Perl code, and the strings are just being
inserted, not precompiled as regular expressions and called.
Incidentally, does anybody know what "$^N" means in Perl? That
abbreviation isn't in the list of special variables.
John Nagle
--
http://mail.python.org/mailman/listinfo/python-list
