Regular expressions Q

Hi All I'm trying to achieve the following: In a text string there may be a number of substrings that match my criteria. I need to retrieve all of them. This is what I have so far and works perfect for the first substring but ignores the possibility of others. I need to know if there are more in the string that match and if so need to have those. ereg("(([[:blank:]+]|^)[09][0-9][4789][0][0-9]{3}[abcABC]?)","$zn[1]",$zaakn ummers1); I thought that ereg would get all of them and store them in the array $zaaknummers1 however this is not the case PHP 4.3.4 What am I doing wrong here? THX Jack