Help: regex, ereg or str_replace?

[clown[NOR]]

I'm currently working on a calendar project that includes an add entry... but I want to strip the message for all "bad" chars... like now you can use HTML tags and everything... so...

 

i know how to use the str_replace, but I've been trying to understand the regex, but I just cant figure it out... can anyone please help me?

[veridicus]

You can find a reference with some examples relating to HTML at DocForge

[clown[NOR]]

thanks m8... i'll read trough it see if it makes me any smarter =)

[clown[NOR]]

i've been trying some combinations, but I just cant figure this out... all i know is that it didn't work..haha.. cuz it allowed this message

 

<strong>this </strong><font size="7">is </font><em>a test </em><table border="12"><tr><td>in the </td></tr><tr><td>validation</td></tr></table>process <br />for <br />new <br />entries

 

this is the ereg code i use: (DONT LAUGH!!  )

ereg('^[a-åA-Å0-9]', $message)

[effigy]

What's a "bad" character--or, often better, what's a "good" character? Use strip_tags to get rid of HTML.

[clown[NOR]]

what i mean with "bad" character is like < > ' /\ etc.. i want 3 things for my message.. normal letters, lower and uprcase, numbers and the " incase i need to qoute something special..hehe

 

btw...thanks for the link

[clown[NOR]]

even tho i know that these cahrs is the one i want, I just dont manage to adde them to the regex()

 

[a-åA-Å0-9]\[,._-]

 

can anyone help me getting the regex() to work?

 

Thanks In Advance

Regards,

Clown

[clown[NOR]]

nobody want to help me?  ???

 

I've been reading on php.net docforge.com regexlib.com and i just don't get it from just that theoretical part.. i need to see it in action

here's an explination about what I want to achive..

 

Valid chars:

abcdefghijklmnopqrstuvwxyzæøå

ABCDEFGHIJKLMNOPQRSTUVWXYZÆØÅ

0123456789

,.-" ()

 

Illegal chars: (if you know any other chars removed.. please let me know)

<>'_/\+*

 

well basicly now i'm asking anyone to please give me if not the whole code, at least a guidline I can use.

 

Please guys

Thanks In Advance

[effigy]

It has only been a few hours since my last response. This is a public forum: people come and go, and so do their responsibilities. Above all, be patient.

 

How is your data encoded? UTF-8?

[clown[NOR]]

i have no idea... how do i check it?

 

btw sorry... thought it had been much more than that... been awake for about 24 hours now

[effigy]

Check the character set of your database (if you're using one) and the one in your meta tag.

[fert]

using regex would just waste CPU power use str_replace or str_ireplace instead.

[effigy]

fert: Regular expressions are "intelligent," whereas str_replace is literal. In this case he needs to work from exclusion rather than inclusion. It's easier to allow 100 characters, than to disallow tens of thousands.

[clown[NOR]]

that was a really good point effigy..hehe well.. but the thing is... i know what to allow.. I just dont know how to add them to a regex()... i've been reading my ass off, and I'm still not able to make it work

[fert]

using regex (haven't tested it, don't know if it'll work)

$str=preg_replace("/[<>'/\\+*]/","",$str);

using str_replace

$chars=array("<",">","'","/","\\","+","*");
$str=str_replace($chars,"",$str);

[effigy]

Clown, you cannot have a list of valid characters and a list of invalid characters if they are not comprehensive; therefore, I'd base the expression off of your valid characters.

 

Here's an example:

 

<meta charset="utf-8"/>
<pre>
<?php

### Borrowed from http://us3.php.net/manual/en/function.utf8-encode.php#58461
function code2utf($num) {
   if($num<128)return chr($num);
   if($num<2048)return chr(($num>>6)+192).chr(($num&63)+128);
   if($num<65536)return chr(($num>>12)+224).chr((($num>>6)&63)+128).chr(($num&63)+128);
   if($num<2097152)return chr(($num>>18)+240).chr((($num>>12)&63)+128).chr((($num>>6)&63)+128) .chr(($num&63)+128);
   return '';
}

$latin_block = array();
foreach (range(32, 591) as $code_point) {
	$latin_block[] = code2utf($code_point);
}

$greek_block = array();
foreach (range(880, 1023) as $code_point) {
	$greek_block[] = code2utf($code_point);
}

$latin_string = join('', $latin_block);
$greek_string = join('', $greek_block);

echo $big_string = $latin_string . $greek_string;
echo '<br>';
echo preg_replace('/[^-,."()a-z0-9\x{00E6}\x{00F8}\x{00E5}]/iu', '', $big_string);

?>
</pre>

[clown[NOR]]

wow..haha =) ok... gonna have to visite that site you borrowed it from...