preg_match pattern question

[dealmaker]

Hi,
I got the following error, and I don't know why. I try to search characters "@#^&-_+=\:;/," at the end of a string. How do I fix it? Many thanks.

Parse error: parse error, unexpected '\"'


class myclass {
const pattern = "/[@#^&\-_+=\\:;/,]$/";
function func($data) {
if(preg_match(self::pattern, $data)) // parse error
echo 'match';
}
}

$var = myclass();
$var->func('12345');

[fci]

just needed some escaping and I removed two of the blackslashes
const pattern = "/[@#^&\-_+=:;\/,]$/";

[dealmaker]

I still got this error message:
Parse error: parse error, unexpected '\"'

How to fix it?

just needed some escaping and I removed two of the blackslashes
const pattern = "/[@#^&\-_+=:;\/,]$/";

[fci]

mm, ah I think it was a result of the double quotes on my part (I had tested using single quotes)
const pattern = '/[@#^&-_+=:;\\/,]$/';

[dealmaker]

why double quotes make it doesn't work? I thought that whenever you have a escape character for special characters, you need double quotes. So why not in this case?

mm, ah I think it was a result of the double quotes on my part (I had tested using single quotes)
const pattern = '/[@#^&-_+=:;\\/,]$/';

[fci]

double quotes means you have to escape more things. I rarely use double quotes. you can use special characters in single quotes as much as you want (well, escape for single quotes which just need a backslash).