title: Detecting russian characters on a form in PHP
body: <p>I have a site where people can submit links to sites about iPhone apps. The guy submits the application name, description, category and URL. This site has years and never received any constructive submission from a russian developer but, unfortunately it was discovered by russian spammers that annoys the hell out of me. Even with all measures against spam, as caption boxes, etc., some guys insist on sending porn russian stuff that has nothing to do with iPhone.</p>
  
  <p>I would like to ban completely any URL or post that is done using russian characters. 
  For URLs I have not much to do, except checking if the URL contains ".ru". But for descriptions, I would like to detect russian characters. How do I do that in PHP?</p>
  
  <p>thanks.</p>