preg_match

[jaymc]

I want to check a variable to see if it contains any of the following chars

[code]&
?
/
\
=
'
"
,
%
+
`
[/code]

I think its best to use preg_match but I'm just a little unsure how to set it all out

I know the syntax ... preg_match("banned chars", $var);

I just dont know how to format the banned chars in the function

Any help?

[Philip]

If you are wanting to format them into something else, why not use preg_replace?

Ahh, I see what you're asking. See post below for a better answer - sorry.

[fert]

you could use strstr
[code]
$words=array("%","&"...);
$num=count($words);

for($count=0;$count<$num;$count++)
{
if(strstr($text,$words[$count]))
{
die("the string has a disallowed charecter");
}
}
[/code]

[Nicklas]

[quote="PHP - Manual"]If you only want to determine if a particular needle  occurs within haystack, use the faster and less memory intensive function [url=http://www.php.net/strpos]strpos()[/url] instead.[/quote]