;
; Ref: Wikipedia, North American Numbering Plan
;
; specifications for demonstration purposes:
;   1. MATCHED phrases
;   2. EMPTY phrases
;   3. NOMATCH phrases - backtracking
;   4. operators, RNM, UDT, TLS, TBS, TRG
;   5; non-ascii characters
;
phone-number = prefix phone-line
prefix = *blank-line
blank-line = *(%d32/%d9) [comment] line-end
comment = ";" *any
any = %d32-126/%d9
phone-line = (regular-number / ornament-number / heavy-number) line-end
regular-number = "(" area ")" u_office "-" subscriber
ornament-number = %d10088 area %d10089 u_office %d8210 subscriber 
heavy-number = %d10090 area %d10091 u_office %d9549 subscriber 

area = gt-2 not-9 digit
subscriber = 4digit

gt-2 = %d50-57
not-9 = %d48-56
digit = %d48-57
line-end = %d10