> So i'm working on a view that will need to parse character
> strings that will have a predictable structure, but dynamic
> content. The format will look like
> "%Zxxxxxxxxxxxxxx^xxxxxxxxxx?;xxxxxxxxxxxxxx? where all x are
> the unpredictable characters and all the rest will be present
> in EVERY string, regardless of content. I'm relatively new to
> django, so there are many functions, and options that i'm
> unaware of, and i'm sure there is some type of split()
> modifier, or some related function that would help in parsing
> the text for use as variety of variables derived from the
> original string.
This sounds like a common use for regular expressions:
>>> s = "%Zxxxxxxxxxxxxxx^xxxxxxxxxx?;xxxxxxxxxxxxxx?"
>>> import re
>>> r = re.compile(r"%Z([^^]*)\^([^?]*)\?;([^?]*)\?")
>>> m = r.match(s)
>>> m.groups()
('xxxxxxxxxxxxxx', 'xxxxxxxxxx', 'xxxxxxxxxxxxxx')
>>> a, b, c = m.groups()
It gets a little confusing to parse that regular expression
because of all the escaping but it's
%Z literal "%Z"
(...) first grouping
[^^]* zero or more characters that aren't a "^"
\^ a literal "^"
(...) second grouping
[^?]* zero or more characters that aren't a "?"
\?; a literal "?;"
(...) third grouping
[^?]* zero or more characters that aren't a "?"
\? a literal "?"
If you need the transform in a view, you'd need to create a
custom filter (see the online help about creating your own filters)
> Also, does anyone happen to know of some command within django
> that will allow me to capture a specific number of leading
> characters? Something like foo =
> original_string.MAGICFUNCTION(4) that would capture the first
> 4 characters and save them to foo would be awesome.
that's easy:
>>> original_string = "this is a test"
>>> original_string[:4]
'this'
Django's template language already contains a "slice" filter
{{ original_string|slice:":4" }}
-tim
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