regex - How to check, if a php string contains only english letters and digits?

Question

In JS I used this code:

if(string.match(/[^A-Za-z0-9]+/))

but I don't know, how to do it in PHP.

Answer 1

Use preg_match().

if (!preg_match('/[^A-Za-z0-9]/', $string)) // '/[^a-zd]/i' should also work.
{
  // string contains only english letters & digits
}