preg_match digits?

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,$result);
echo "$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.

In article <40BBDBB4.F0F19AE8@nospamun8nospam.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($string{$index})) {
$found .= $string{$index};
}
++$index;
}


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

Tim Van Wassenhove wrote:

> In article <40BBDBB4.F0F19AE8@nospamun8nospam.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($string{$index})) {
> $found .= $string{$index};
> }
> ++$index;
> }
>
> --
> Tim Van Wassenhove <http://home.mysth.be/~timvw/contact.php>

Tim, that's a joke, right?

In article <40BBED21.44389456@nospamun8nospam.com>, Westcoast Sheri wrote:
> Tim Van Wassenhove wrote:
>
>> In article <40BBDBB4.F0F19AE8@nospamun8nospam.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($string{$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>

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');
?>

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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)

Tim Van Wassenhove wrote:

> In article <40BBED21.44389456@nospamun8nospam.com>, Westcoast Sheri wrote:
> > Tim Van Wassenhove wrote:
> >
> >> In article <40BBDBB4.F0F19AE8@nospamun8nospam.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($string{$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 20adiidkk4kidid39399399dkkdkkkdk';
$dig = substr(preg_replace("/\D/",'',$string),0,2);
echo $dig;
?>

Takes .000027 to run.

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

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

In article <40BCDEDB.F664DB67@nospamun8nospam.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 20adiidkk4kidid39399399dkkdkkkdk';
> $dig = substr(preg_replace("/\D/",'',$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($string{$index})) {
$found .= $string{$index};
}
++$index;
}
return $found;
}

function test2($string) {
$dig = substr(preg_replace("/\D/",'',$string),0,2);
return $dig;
}


$strings = array(
'12sqdmfksdjflmqsdfjlm',
'sdfsqdf3mkjmklj4',
'a56qsdfmqsdfkj',
'sdf7dqfdsf8dqfdf',
'a 20adiidkk4kidid39399399dkkdkkkdk'
);

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

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

?>

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