Code explanation

[coop]

Hi all,

I have this function for checking valid emails but I'm a bit stuck with some of the code

[code]
function valid_email($email){
  // check if email is valid
  if( !eregi(“^[a-z0-9]+([_\\.-][a-z0-9]+)*”.”@([a-z0-9]+([\.-][a-z0-9]+))*$”,$email, $regs)){
    return false;
  } else if( gethostbyname($regs[2]) == $regs[2] ){
      // if host is invalid
      return false;
  } else {
      return true;
  }
}
[/code]

it's this bit I dont understand
[code]
!eregi(“^[a-z0-9]+([_\\.-][a-z0-9]+)*”.”@([a-z0-9]+([\.-][a-z0-9]+))*$”,$email, $regs)
[/code]

I know eregi is the case insensitive regular expression match, but it's the rest I dont understand, could someone explain.

[craygo]

this might help explain

http://weblogtoolscollection.com/regex/regex.php

Ray