Regx Question

Hi All I have the following in the users and acct_users files DEFAULT Called-Station-Id == "0198334115", Proxy-To-Realm := "xxxx.com" I would like to match on "198334115" with a possibility of about 4 to 6 more number on the front of this number. I have tried a number of difference regx's but non of them have worked so I must have something wrong :) Any ideas would be great. Thanks Mike