reg split address

I have a submit field that may have an address formatted like: 1234 main st or may just be the street name: main I need to split the number off if present so I can test against database fields. I need a eregi, split or preg_split that could do that. I've tried a few and either get the whole string in the first array element, or it fails to see the digits. if(eregi('[:digits:]+',$streetSearch,$streetArray)) die("num: $streetArray[0] name=$streetArray[1]"); if(eregi('([\d]+) (.+)',$streetSearch,$streetArray)) die("num: $streetArray[0] name=$streetArray[1]"); list($streetNum,$streetName)=split('(\d+) ',$streetSearch);die($streetNum); $streetArray=preg_split('/^(\d+) (.+)/',$streetSearch); die("street number: $streetArray[0] street name:$streetArray[1]"); any help would be appreciated. Terry