pattern match and extract problem

[David Moore]

Hi All,
I expect someone can crack this one in no time.

Ok, what I'd like to do is to match a pattern in a string and extract a
portion of it. For example if I had a string like:

'The store had apples(20) and pears(30)'

how do I extract the '20' and '30'? ie. if the pattern is 'apples(??)', how
do I expect the '??'.


Ta in advance,
Dave

[Sean Barton]

Re: pattern match and extract problem

easy enough. you can use a string tokeniser and use the ( as the
delimeter. it depends on how random the string will be to how you will
harvest the number.

for example:

$string = strtok($longstr ing,'(');

will give you:

20) and pears

then from then you can go...

$num1 = strtok($string, ')');

$num1 would be 20.

its basic but would work.now its up to you how you work it you can run
more than one tokeniser at once so tokenise at the ' ' to get each word
or look into a function called explode()

i suppose to say that if the strings will be pretty regular then you
can use this and if not you would have to make it a little more dynamic


hope this helps

Sean Barton

[Allen]

Re: pattern match and extract problem

On Tue, 07 Feb 2006 16:05:32 -0500, David Moore
<dave_m_moore@p ost2me.freeserv e.co.uk> wrote:
[color=blue]
> Hi All,
> I expect someone can crack this one in no time.
>
> Ok, what I'd like to do is to match a pattern in a string and extract a
> portion of it. For example if I had a string like:[/color]

I prefer using the preg functions to extract parts of strings, but that
requires at least a basic understanding of regular expressions. At any
rate, if you want to capture all instances of word(number) you could do
this:
preg_match_all( '/[a-z]+\(([0-9]+)\)/im',$string,$ma tches);

$matches[0] would be an array of apples(20), pears(30) etc.,
$matches[1] would be an array of all the numbers (20, 30, etc.)

regex match result -> http://tinyurl.com/9yrmc

A.

--

http://RReplace.com

A Web based regular expressions powered find/replace utility

[Jim Michaels]

Re: pattern match and extract problem


"David Moore" <dave_m_moore@p ost2me.freeserv e.co.uk> wrote in message
news:dsb232$ean $1@news7.svr.po l.co.uk...[color=blue]
> Hi All,
> I expect someone can crack this one in no time.
>
> Ok, what I'd like to do is to match a pattern in a string and extract a
> portion of it. For example if I had a string like:
>
> 'The store had apples(20) and pears(30)'
>
> how do I extract the '20' and '30'? ie. if the pattern is 'apples(??)',
> how do I expect the '??'.[/color]

sounds like you only want the numbers. easy.
preg_match_all( "/\((\d\d)\)/", $string, $matches);
or if you want to handle any number of digits,
preg_match_all( "/\((\d+)\)/", $string, $matches);
[color=blue]
>
>
> Ta in advance,
> Dave
>
>[/color]