One liner for extracting a number

[D. Alvarado]

Hello,
Can regular expressions help me here? I want to extract a number
from a string which will always be of the form "parameter###" where
"###" is an arbitrary number of numeric digits. So if my string
contained

parameter24
parameter8
parameter90210

I would want to extract "24", "8", and "90210" respectively.

Thanks for any help, -

[kingofkolt]

"D. Alvarado" <la***********@zipmail.com> wrote in message
news:9f**************************@posting.google.c om...

Hello,
Can regular expressions help me here? I want to extract a number
from a string which will always be of the form "parameter###" where
"###" is an arbitrary number of numeric digits. So if my string
contained

parameter24
parameter8
parameter90210

I would want to extract "24", "8", and "90210" respectively.

Thanks for any help, -

If the string will always contain only "parameter###" and nothing before or
after "parameter###", then this should work:

$str = "parameter24";
preg_match( "/parameter(\d+)/", $str, $matches );
print_r( $matches );

/* OUTPUT:

Array
(
[0] => parameter24
[1] => 24
)

*/

[Chris Hope]

D. Alvarado wrote:

Hello,
Can regular expressions help me here? I want to extract a number
from a string which will always be of the form "parameter###" where
"###" is an arbitrary number of numeric digits. So if my string
contained

parameter24
parameter8
parameter90210

I would want to extract "24", "8", and "90210" respectively.

In this example $string is your string like "parameter90210". $matches is an
array containing the matches where $matches[1] is the stuff matched
inbetween ()

ereg("parameter([0-9]*)", $string, $matches);

--
Chris Hope - The Electric Toolbox - http://www.electrictoolbox.com/

[Ian.H]

On Sat, 14 Aug 2004 20:00:56 -0700, D. Alvarado wrote:

Hello,
Can regular expressions help me here? I want to extract a number
from a string which will always be of the form "parameter###" where
"###" is an arbitrary number of numeric digits. So if my string
contained

parameter24
parameter8
parameter90210

I would want to extract "24", "8", and "90210" respectively.

Thanks for any help, -

preg_match('/([0-9]+)$/', $your_string, $matches);
$digits = $matches[1];

Regards,

Ian

Note: preg_* is faster and much more flexible than ereg* functions =)

--
Ian.H
digiServ Network
London, UK
http://digiserv.net/

[Chung Leong]

"D. Alvarado" <la***********@zipmail.com> wrote in message
news:9f**************************@posting.google.c om...

Hello,
Can regular expressions help me here? I want to extract a number
from a string which will always be of the form "parameter###" where
"###" is an arbitrary number of numeric digits. So if my string
contained

parameter24
parameter8
parameter90210

I would want to extract "24", "8", and "90210" respectively.

Thanks for any help, -

Well, if it will always be "parameter###", then you can simply trim off the
first 9 characters of the text.

$num = (int) substr($s, 9);

[Christopher Finke]

"D. Alvarado" <la***********@zipmail.com> wrote in message
news:9f**************************@posting.google.c om...

Can regular expressions help me here? I want to extract a number
from a string which will always be of the form "parameter###" where
"###" is an arbitrary number of numeric digits. So if my string
contained

parameter24
parameter8
parameter90210

I would want to extract "24", "8", and "90210" respectively.

I can't believe no one has mentioned this:

$string = "parameter1234";
$number = str_replace("parameter","",$string);

Chris Finke

[Gary L. Burnore]

On Sun, 15 Aug 2004 01:17:43 -0500, "Christopher Finke"
<ch***@efinke.com> wrote:

"D. Alvarado" <la***********@zipmail.com> wrote in message
news:9f**************************@posting.google. com...

Can regular expressions help me here? I want to extract a number
from a string which will always be of the form "parameter###" where
"###" is an arbitrary number of numeric digits. So if my string
contained

parameter24
parameter8
parameter90210

I would want to extract "24", "8", and "90210" respectively.

I can't believe no one has mentioned this:

$string = "parameter1234";
$number = str_replace("parameter","",$string);

If I would have seen his post before yours, I would have. :)

Wonder why his isn't in the spool. Hmmmmm...... Better go look.
--
gburnore@databasix dot com
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[D. Alvarado]

These are all excellent solutions. You guys rock!

"Chung Leong" <ch***********@hotmail.com> wrote in message news:<ZZ********************@comcast.com>...

"D. Alvarado" <la***********@zipmail.com> wrote in message
news:9f**************************@posting.google.c om...

Hello,
Can regular expressions help me here? I want to extract a number
from a string which will always be of the form "parameter###" where
"###" is an arbitrary number of numeric digits. So if my string
contained

parameter24
parameter8
parameter90210

I would want to extract "24", "8", and "90210" respectively.

Thanks for any help, -

Well, if it will always be "parameter###", then you can simply trim off the
first 9 characters of the text.

$num = (int) substr($s, 9);