search string partially

[jagguy]

I search this string for non-alpha numeric chars and get rid of them.

 

$my2 = preg_replace("/[^a-zA-Z0-9s]/", "", $my);

 

What i want to do is the same but allow the string to keep a '.' or a '_' (dot and underscore).

 

eg my3_one.txt    is a string i would allow but

my3*one.txt is not allowed.

 

How do i do this ?

[Caesar]

<?php

  $newstr = preg_replace('/[^a-zA-Z0-9\.\_ ]+/i', '', $string);

?>

[drewbee]

Close. Characters are not interpretered AS IS and do not need to be escaped when within [ and ]

 

<?php

  $newstr = preg_replace('/[^_a-zA-Z0-9.]+/i', '', $string);

?>

[jagguy]

This doesn't replace a '.' fullstop when places at the end of a string.

What else doesn't this do?

 

if i enter    wewew.

 

(the fullstop at the end still appears)

 

$title=(str_replace(".", "", $title));

$title2 = preg_replace("/[^a-zA-Z0-9s]/", "", $title);

[MemphiS]

<?php

if (!ctype_alnum(str_replace(array(".","_"),"",$title)){
print("Invalid...");
}elseif (ctype_alnum(str_replace(array(".","_"),"",$title)){

?>

 

This Checks $title for letters and numbers. A . and _ are allowed within the $title.

[jagguy]

I don't want any '.' fullstops in my string. I want them deleted .

This fails to do this why?

 

$title2 = preg_replace("/[^a-zA-Z0-9s]/", "", $title);

 

I dont fully understand what this does but is it possible to still use pregreplace?

I only want numbers and letters and that is it, no other char allowed.

 

ctype_alnum(str_replace(array(".","_"),"",$title)

[ToonMariner]

you said in your fisrst post you wanted to keep the full stops!!!!!

 

try...

 

$title2 = preg_replace("/[^a-zA-Z0-9\.]/", "", $title);

[jagguy]

This is a different q) than the first sorry.

 

This still fails to work if you have a fullstop at the end of a string $title

 

$title2 = preg_replace("/[^a-zA-Z0-9\.]/", "", $title);

 

if (strcmp($title2,$title)>0) //wont detect the fullstop at the end of string

  {

    mysql_close($link);

    header( "Location: ". $myvar."/upmessage.php" );

    exit;

 

  }

[ToonMariner]

Sorry didn't notice the hat

 

$title2 = preg_replace("/[^a-zA-Z0-9]|[\.]/", "", $title);

[drewbee]

Please check my last post.

[ToonMariner]

please re iterate what you want - its a clear as mud (well not that bad but lets get it clear).

 

you want to remove any non-alphanumeric apart from '.' is that correct?

[drewbee]

<?php
$string = "a string with random.bloody_charecters!!!";

  $newstr = preg_replace('/[^_a-z0-9.]+/i', '', $string);

echo $newstr;

// outputs :astringwithrandom.blood_charecters
?>

[jagguy]

When i validate  a name as in uploaded filename i can't remove all nonalphanumeric chars with this preg_replace  (ex the . and _ char)

 

I can't remove the quote ` symbol from $filename.

I do the 2 lines below 1st .

 

$filename=  $_FILES['uploadedfile']['name'];

$filename=str_replace(" ", "_", $filename)  ;

 

this fails to remove ` symbol

$file2= preg_replace('/[^a-zA-Z0-9\.\_ ]+/i', '', $filename);

 

this works but i don't want to use it.

// $filename=str_replace("`", "", $filename) ;

 

this fails

if ( strpos($filename,"`")===true)

 

 

I want to compare the original to see if there is any no alpha chars ex for . _ and no spaces. If there is say a ` or % then simply redirect but the strcmp seems to fail.

 

 

if (strcmp($filename,$file2)!=0)

{

    mysql_close($link);

    header( "Location: ". $myvar."/upfile.php" );

    exit;

}

[jagguy]

redo above

 

 

Now i want to detect whether a non alphanumic char is present except for the . and _ char. and then redirect page.

 

I cant do this as this fails redirect page ,if a string that has non alphanumic char is present like the ` char

 

$filename= $_FILES['uploadedfile']['name'];

$filename=str_replace(" ", "_", $filename) ;

// $filename=str_replace("`", "", $filename) ;

$file2= preg_replace('/[^a-zA-Z0-9\.\_ ]+/i', '', $filename);

 

 

 

$file2= mysql_real_escape_string($filename);

 

 

if (strcmp($filename,$file2)!=0)

{

//redirect

[jagguy]

I just found a preg_match command

[ToonMariner]

but you want to REPLACE things - at least thats what your OP said anyway....