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Posted by Rik Wasmus on 11/28/07 12:33
On Wed, 28 Nov 2007 10:44:14 +0100, taps128 <nstjelja@gmail.com> wrote:
> Hi, all. I have a poroblem, and I'd really appreciate if someone helped
> me to solve it.
>
> The problem is, I want to take the first two sentences of a string. To
> do that i need to split them whenever a dot occurs, and the join the
> first two array occurences in a new string but I have a problem beacuse
> the dot in the Croatian languages is not always used a sentence
> delimiter, but is often used in conjuction with numbers and acronyms. So
> I wanted to use a regular expression to split a string on every dot
> ocurence but not when a dot is precedeed by a number or a 'd' or a 'o'.
> This is my best shot at it:
>
> $string='Glavna skupština Društva će se održati 27.12.2007. (četvrtak) u
> 11 sati u prostorijama Doma hrvatske vojske u Lori u Splitu.Atlas
> turistička agencija d.d. stekla je 22. i 23. studenog 2007. godine 2800
> vlastitih dionica.';
> $uvod=preg_split('/((d\.o\.o\.)!|(d\.d\.)!|[0-9]!)|\./', $string);
> print_r($uvod);
>
> But it doesn't work right. If someone knows how to slove this problem.
> Any help will be really appreciated.
Well, you main problem here is to decide WHEN a dot is ending a sentence.
Not a very simple task without lists of known acronyms. Also, a dot after
a number can end a sentence:"The coldest winter I remember was in 1985.
The temperature the day my sister was born dropped as low as -21C.". How
do you propose this is handled? Formulating the exact requirements before
writing the regex is more then half the work.
A start for you (by no means complete):
A sentence is ended by a dot:
- followed by either $ (for which case we don't need a regex, it will end
automatically there), or:
- at least one whitespace character (\s) (well, it should be, damn those
kids nowadays), followed by a capital letter (\p{Lu}, use utf-8 mode).
That would be:
preg_split('/\.\s+(?=\p{Lu})/u',$string);
....which doesn't split your string anywhere, as my rules for
'sentence-ending' seem to be inadequeate for your string, or no sentence
is ended.
I think this will require some hefty '(not) pre/proceded by' operators, as
you'd like the matched text to be in the split. Even then a 100% success
rate will most definitly by out of the question.
--
Rik Wasmus
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