[SOLVED] preg_replace Help

[jnerotrix]

in my code i want it to replace Everything But Numbers to 0

 

So If a User Types Anything but a number it will replace it with 0

 

Heres the code i have so far

<?php
   $roll_no = $_POST['roll_no'];

$string = $roll_no;
$replace = "0";
$result = preg_replace("[^A-Z]","$replace", $string);
$roll_no = $result;
?>

[.josh]

[^\d]

[jnerotrix]

what do i do with [^\d]

[.josh]

use [^\d] instead of [^A-Z]

[jnerotrix]

Now it changes numbers to 0 zero also i dont want this

 

Just Symbols = + ; " like this and letters A-Z

 

But Numbers are Unchanged

[jnerotrix]

I need so When user types in the form a letter or Symbol or any thing other than a number

 

it replaces that letter or or symbol with the number 0 zero

[jnerotrix]

I solved it i used this code

 

  $roll_no = $_POST['roll_no'];

$string = $roll_no;
$replace = "0";
$result = preg_replace("/[^0-9s]/","$replace", $string);
$roll_no = $result;

[.josh]

\d is shorthand for [0-9]  and why is that 's' in there? your [^0-9s] pattern will replace anything that is not a number or 's' with 0 so if you have this:

 

abcs123

 

you will get this:

 

000s123

 

 

[^\d] will replace anything that is not 0-9 just the same. If it didn't work then you messed up somewhere else in your code.

[premiso]

\d is shorthand for [0-9]  and why is that 's' in there? your [^0-9s] pattern will replace anything that is not a number or 's' with 0 so if you have this:

 

abcs123

 

you will get this:

 

000s123

 

 

[^\d] will replace anything that is not 0-9 just the same. If it didn't work then you messed up somewhere else in your code.

 

I think that s represents the space if you do \ds the above function will work fine, but without the s it does not.

[.josh]

s represents 's'

 

\s represents a space.

 

<?php
$patterns = array('[^\d]','[^0-9]','[^0-9s]','[^\ds]','[^0-9\s]','[^\d\s]');
$string = "aklsdj sldkj 23 0j0j23 0392sd0n iss230i ssss";
echo "<pre>";
echo "<table>";
echo "<tr><td>subject-></td><td>$string</td></tr>";
echo "<tr><td>pattern</td><td>result</td></tr>";
foreach ($patterns as $p) {
   echo "<tr><td>$p</td><td>" . preg_replace("/{$p}/", "0", $string). "</td></tr>";
}
echo "</table>";
echo "</pre>";
?>

 

output:

subject-> aklsdj sldkj 23 0j0j23 0392sd0n iss230i ssss
pattern   result
[^\d]     00000000000002300000230039200000000230000000
[^0-9]    00000000000002300000230039200000000230000000
[^0-9s]   000s000s0000023000002300392s00000ss23000ssss
[^\ds]    000s000s0000023000002300392s00000ss23000ssss
[^0-9\s]  000000 00000 23 000023 03920000 0002300 0000
[^\d\s]   000000 00000 23 000023 03920000 0002300 0000

[premiso]

s represents 's'

 

\s represents a space.

 

<?php
$patterns = array('[^\d]','[^0-9]','[^0-9s]','[^\ds]','[^0-9\s]','[^\d\s]');
$string = "aklsdj sldkj 23 0j0j23 0392sd0n iss230i ssss";
echo "<pre>";
echo "<table>";
echo "<tr><td>subject-></td><td>$string</td></tr>";
echo "<tr><td>pattern</td><td>result</td></tr>";
foreach ($patterns as $p) {
   echo "<tr><td>$p</td><td>" . preg_replace("/{$p}/", "0", $string). "</td></tr>";
}
echo "</table>";
echo "</pre>";
?>

 

output:

subject-> aklsdj sldkj 23 0j0j23 0392sd0n iss230i ssss
pattern   result
[^\d]     00000000000002300000230039200000000230000000
[^0-9]    00000000000002300000230039200000000230000000
[^0-9s]   000s000s0000023000002300392s00000ss23000ssss
[^\ds]    000s000s0000023000002300392s00000ss23000ssss
[^0-9\s]  000000 00000 23 000023 03920000 0002300 0000
[^\d\s]   000000 00000 23 000023 03920000 0002300 0000

 

Hmm, not sure what is going on, but I get the same results as jnero when I run it with the s

 

<?php
   $roll_no = $_POST['roll_no'];

   $roll_no = "hello 12343 hello$%#%";
$string = $roll_no;
$replace = "0";
$result = preg_replace("/[^\ds]/",$replace, $string);
$roll_no = $result;
echo $result;
die;
?>

 

Result prints out

000000123430000000000

 

Maybe it is a server setting? I do not know...

[.josh]

why don't you try putting an 's' in your $roll_no string

 

$roll_no = "hello 12343 hello$%#% ssss";

[premiso]

Very weird. I just tried it again with this:

 

<?php
   $roll_no = $_POST['roll_no'];

   $roll_no = "hello 12343 hello$%#%s";
$string = $roll_no;
$replace = "0";
$result = preg_replace("/[^\d]/",$replace, $string);
$roll_no = $result;
echo $result;
die;
?>

 

And it now yields what it was doing with s...before it would just display the whole string. I must have been doing a typo somewhere...

[effigy]

[^\d]

 

FYI: You can use \D for this also.