preg_match digits?

[Westcoast Sheri]

What is the most efficient way of extracting the first two digits in a
string?

The following is wrong for me, because it only gives me the first
instance of two digits together:

$string = ujdk3ca94abc
preg_match("/\d{2}/",$string,$resu lt);
echo "$result[0]";
//prints 94. However, the result I am looking for is 39

Here's another example:
$string = 'abc 8a bc abc934';
//desired result = 89

Thank you.

[Tim Van Wassenhove]

In article <40************ ***@nospamun8no spam.com>, Westcoast Sheri wrote:

What is the most efficient way of extracting the first two digits in a
string?

The following is wrong for me, because it only gives me the first
instance of two digits together:

$found = '';

$index = 0;

while (strlen($found) < $needed && $index < strlen($string) ) {
if (is_numeric($st ring{$index})) {
$found .= $string{$index} ;
}
++$index;
}
--
Tim Van Wassenhove <http://home.mysth.be/~timvw/contact.php>

[Westcoast Sheri]

Tim Van Wassenhove wrote:

In article <40************ ***@nospamun8no spam.com>, Westcoast Sheri wrote:

What is the most efficient way of extracting the first two digits in a
string?

The following is wrong for me, because it only gives me the first
instance of two digits together:

$found = '';

$index = 0;

while (strlen($found) < $needed && $index < strlen($string) ) {
if (is_numeric($st ring{$index})) {
$found .= $string{$index} ;
}
++$index;
}

--
Tim Van Wassenhove <http://home.mysth.be/~timvw/contact.php>

Tim, that's a joke, right?

[Tim Van Wassenhove]

In article <40************ ***@nospamun8no spam.com>, Westcoast Sheri wrote:

Tim Van Wassenhove wrote:

In article <40************ ***@nospamun8no spam.com>, Westcoast Sheri wrote:

> What is the most efficient way of extracting the first two digits in a
> string?
>
> The following is wrong for me, because it only gives me the first
> instance of two digits together:
$found = '';

$index = 0;

while (strlen($found) < $needed && $index < strlen($string) ) {
if (is_numeric($st ring{$index})) {
$found .= $string{$index} ;
}
++$index;
}

Tim, that's a joke, right?

1-) It works.
2-) I presume it's more efficient than using regular expressions.

Up to you proove me wrong :D
--
Tim Van Wassenhove <http://home.mysth.be/~timvw/contact.php>

[Pedro Graca]

Westcoast Sheri wrote:

What is the most efficient way of extracting the first two digits in a
string?

<?php
function digits($string, $length, $pad) {
$temp = preg_replace('=[^0123456789]=', '', $string);
for ($i = 0; $i < $length; ++$i) $temp .= $pad;
return substr($temp, 0, $length);
}

$string = 'ujdk3ca94abc';
echo digits($string, 2, '0');
$string = 'abc 8a bc abc934';
echo digits($string, 2, '0');
?>

--
USENET would be a better place if everybody read: : mail address :
http://www.catb.org/~esr/faqs/smart-questions.html : is valid for :
http://www.netmeister.org/news/learn2quote2.html : "text/plain" :
http://www.expita.com/nomime.html : to 10K bytes :

[Westcoast Sheri]

Pedro Graca wrote:

Westcoast Sheri wrote:

What is the most efficient way of extracting the first two digits in a
string?

<?php
function digits($string, $length, $pad) {
$temp = preg_replace('=[^0123456789]=', '', $string);
for ($i = 0; $i < $length; ++$i) $temp .= $pad;
return substr($temp, 0, $length);
}

$string = 'ujdk3ca94abc';
echo digits($string, 2, '0');
$string = 'abc 8a bc abc934';
echo digits($string, 2, '0');
?>

--
USENET would be a better place if everybody read: : mail address :
http://www.catb.org/~esr/faqs/smart-questions.html : is valid for :
http://www.netmeister.org/news/learn2quote2.html : "text/plain" :
http://www.expita.com/nomime.html : to 10K bytes :

thanks! That looks like what I was looking for. Although, I thought there
was a "code" you could put after the preg_match part just to return the
first 2 digits.... I guess there's not? Also, here's another question: what
does the "6" mean in the following line of code? I know the "5" means to
find 5 digits in a row....but what's the "6" mean?
preg_match("/[0-9]{5,6}/",$string,$blah )

[Westcoast Sheri]

Tim Van Wassenhove wrote:

In article <40************ ***@nospamun8no spam.com>, Westcoast Sheri wrote:

Tim Van Wassenhove wrote:

In article <40************ ***@nospamun8no spam.com>, Westcoast Sheri wrote:
> What is the most efficient way of extracting the first two digits in a
> string?
>
> The following is wrong for me, because it only gives me the first
> instance of two digits together:

$found = '';

$index = 0;

while (strlen($found) < $needed && $index < strlen($string) ) {
if (is_numeric($st ring{$index})) {
$found .= $string{$index} ;
}
++$index;
}

Tim, that's a joke, right?

1-) It works.
2-) I presume it's more efficient than using regular expressions.

Up to you proove me wrong :D

--
Tim Van Wassenhove <http://home.mysth.be/~timvw/contact.php>

Answer:

<?php
$string = 'a 20adiidkk4kidid 39399399dkkdkkk dk';
$dig = substr(preg_rep lace("/\D/",'',$string),0 ,2);
echo $dig;
?>

Takes .000027 to run.

[Matthias Esken]

Pedro Graca wrote:

Westcoast Sheri wrote:

What is the most efficient way of extracting the first two digits in a
string?

<?php
function digits($string, $length, $pad) {
$temp = preg_replace('=[^0123456789]=', '', $string);
for ($i = 0; $i < $length; ++$i) $temp .= $pad;
return substr($temp, 0, $length);
}

$string = 'ujdk3ca94abc';
echo digits($string, 2, '0');
$string = 'abc 8a bc abc934';
echo digits($string, 2, '0');
?>

That's a very flexible function and you're my god. :-) Nevertheless, if
you just need what the original poster asked for, you could use a simple
regular expression:

function digits2($string ) {
$return = '';
if (preg_match('~( \d)[^\d]*(\d)~', $string, $matches)) {
$return = $matches[1] .$matches[2];
}
return $return;
}

Regards,
Matthias

[Matthias Esken]

Westcoast Sheri schrieb:

thanks! That looks like what I was looking for. Although, I thought there
was a "code" you could put after the preg_match part just to return the
first 2 digits.... I guess there's not? Also, here's another question: what
does the "6" mean in the following line of code? I know the "5" means to
find 5 digits in a row....but what's the "6" mean?
preg_match("/[0-9]{5,6}/",$string,$blah )

Minimum:5, Maximum:6.

Regards,
Matthias

[Tim Van Wassenhove]

In article <40************ ***@nospamun8no spam.com>, Westcoast Sheri wrote:

Tim Van Wassenhove wrote:

1-) It works.
2-) I presume it's more efficient than using regular expressions.
Up to you proove me wrong :D

Answer:

<?php
$string = 'a 20adiidkk4kidid 39399399dkkdkkk dk';
$dig = substr(preg_rep lace("/\D/",'',$string),0 ,2);
echo $dig;
?>

Takes .000027 to run.

Feel free to run the following script a few times ;)
test1 always had a smaller execution time than test2 when i tried....
<?php

function test1($string, $needed) {
$found = '';
$index = 0;

while (strlen($found) < $needed && $index < strlen($string) ) {
if (is_numeric($st ring{$index})) {
$found .= $string{$index} ;
}
++$index;
}
return $found;
}

function test2($string) {
$dig = substr(preg_rep lace("/\D/",'',$string),0 ,2);
return $dig;
}
$strings = array(
'12sqdmfksdjflm qsdfjlm',
'sdfsqdf3mkjmkl j4',
'a56qsdfmqsdfkj ',
'sdf7dqfdsf8dqf df',
'a 20adiidkk4kidid 39399399dkkdkkk dk'
);

$start = microtime();
foreach($string s as $string) {
test1($string,2 );
}
$end = microtime();
echo '<br>total: ' . ($end - start);

$start = microtime();
foreach($string s as $string) {
test2($string);
}
$end = microtime();
echo '<br>total: ' . ($end - start);

?>

--
Tim Van Wassenhove <http://home.mysth.be/~timvw/contact.php>