Scan/Sub-Array Selection Expression

token IDENTIFIER  of type String
token COMMA

token LPAREN
token RPAREN
token WHITE

token INT      of type String
token QSTRING  of type String
token REGEX    of type String

token COLON
token SEMICOLON

type TEN scanstatement
type TEN indexcombexpr
type TEN scanidrange
type TEN scanidbounds

scanstatement: indexcombexpr 
             | LPAREN indexcombexpr RPAREN

indexcombexpr: scanidrange
             | scanidbounds
             | scanidrange COMMA indexcombexpr
             | scanidbounds COMMA indexcombexpr

scanidbounds: LT INT
            | GT INT
            | LE INT
            | GE INT
            | GE INT AMPERSAND LE INT
            | GT INT AMPERSAND LT INT

scanidrange: INT
           | INT TILDA INT