php question

[codrgii]

using preg replace, how do i make it accept only smallcase a-z, capitals A-Z, numbers 0-9 and the characters : and _  and replace any other characters not in this list to ''?

 

i got the numbers and letters working but not the character : and _, does anyone know how to do this?

[emehrkay]

I'm pretty sure it is

[a-zA-Z0-9:_]

 

Or even

\w:_

[codrgii]

and how would i use preg_replace for something like emails, where it only accepts @, . and numbers and letters (smallcase / uppercase)?

[Garethp]

preg_match('~[a-zA-Z0-9]+@[a-zA-Z0-9]+\.[a-zA-Z]+~', $input);

[wildteen88]

I would recommend you to take a look at regular-expressions.info for common regex patterns. It helped me understand regex when I was learning.