Hi rbobcat1
I guess you are searching for Data Validation not Conditional Format..
Please confirm if not..
If your data is in a2.. then try this in Data > Data Validation > Custom > Formula as..
=(MID($A2,11,1)=".")*(LEN($A2)=12)*(AND(ISNUMBER(MID($A2,ROW($1:$10),1)+0)))*(ISTEXT(RIGHT($A2)))