Splitting a string

[Nico Grubert]

Dear Python users,

I'd like to split a string where 'and', 'or', 'and not' occurs.

Example string:
s = 'Smith, R. OR White OR Blue, T. AND Black AND Red AND NOT Green'

I need to split s in order to get this list:
['Smith, R.', 'White', 'Blue, T.', 'Back', 'Red', 'Green']

Any idea, how I can split a string where 'and', 'or', 'and not' occurs?


Thank you very much in advance,
Nico

[Dylan Moreland]

Re: Splitting a string

Take a look at:

http://docs.python.org/lib/node115.html#l2h-878

So I would try something like:

pat = re.compile(r" (?:AND|OR|AND NOT) ")
pat.split(strin g)

Compile the regular expression with re.IGNORECASE if you like.

Nico Grubert wrote:[color=blue]
> Dear Python users,
>
> I'd like to split a string where 'and', 'or', 'and not' occurs.
>
> Example string:
> s = 'Smith, R. OR White OR Blue, T. AND Black AND Red AND NOT Green'
>
> I need to split s in order to get this list:
> ['Smith, R.', 'White', 'Blue, T.', 'Back', 'Red', 'Green']
>
> Any idea, how I can split a string where 'and', 'or', 'and not' occurs?
>
>
> Thank you very much in advance,
> Nico[/color]

[Fredrik Lundh]

Re: Splitting a string

Dylan Moreland wrote:
[color=blue]
> So I would try something like:
>
> pat = re.compile(r" (?:AND|OR|AND NOT) ")
> pat.split(strin g)[/color]

footnote: this yields:

['Smith, R.', 'White', 'Blue, T.', 'Black', 'Red', 'NOT Green']

(the | operator picks the first (leftmost) alternative that results in an
overall match.)

</F>

[Dylan Moreland]

Re: Splitting a string

Woops! Thanks for the correction. I was assuming greediness for some
reason.

Fredrik Lundh wrote:[color=blue]
> Dylan Moreland wrote:
>[color=green]
> > So I would try something like:
> >
> > pat = re.compile(r" (?:AND|OR|AND NOT) ")
> > pat.split(strin g)[/color]
>
> footnote: this yields:
>
> ['Smith, R.', 'White', 'Blue, T.', 'Black', 'Red', 'NOT Green']
>
> (the | operator picks the first (leftmost) alternative that results in an
> overall match.)
>
> </F>[/color]

[Paul Rubin]

Re: Splitting a string

Nico Grubert <nicogrubert@gm ail.com> writes:[color=blue]
> I'd like to split a string where 'and', 'or', 'and not' occurs.[/color]

Other people have suggested how to do this splitting. But don't you
really want a parser?

[Christoph Zwerschke]

Re: Splitting a string

Nico Grubert wrote:
[color=blue]
> I'd like to split a string where 'and', 'or', 'and not' occurs.
> Example string:
> s = 'Smith, R. OR White OR Blue, T. AND Black AND Red AND NOT Green'[/color]

Here is a solution without using the re module:
s.replace(' AND NOT ', ' OR ').replace(' AND ', ' OR ').split(' OR ')

-- Christoph