Filter extension

[doubledee]

How do I know if Filter extension is on with my webhost?

 

Or does it always work with PHP5?

 

If I cannot use it, can someone recommend a good regex to validate EMAIL addresses??

 

Thanks,

 

 

Debbie

 

[requinix]

How do I know if Filter extension is on with my webhost?

Try phpinfo or extension_loaded, or look in your control panel thing for whether it lists PHP modules.

 

Or does it always work with PHP5?

5.2+ has it built-in.

 

If I cannot use it, can someone recommend a good regex to validate EMAIL addresses??

1. Make sure it has a @.

2. Make sure the domain name has at least one period.

3. Optionally, use getmxrr to see if the domain accepts email (implying that the domain exists).

Unless you go horribly complicated, anything more than that will create false negatives. Send a confirmation email if you want to be sure the address is good.

With email addresses you can't catch many typos and it's trivial to bypass a perfect validator. Don't put too much thought into it.