substring notation造句

Substrings within strings are accessed using a substring notation : " A $ ( L, R ) " or " A $ [ L, R ] ", where the substring begins with the leftmost character specified by the index L and continues to the rightmost character specified by the index R, " A $ [ L ] " where the substring starts at the leftmost character specified by the index L and continues to the end of the string . ( TSB accepts ( ) or [ ] interchangeably . ) This is in sharp contrast to some later microcomputer BASICs that use functions such as LEFT $ ( ), MID $ ( ), and RIGHT $ ( ) to access substrings, although ANSI BASIC continues to use a similar substring syntax to that introduced by Hewlett-Packard.
It's difficult to find substring notation in a sentence. 用substring notation造句挺难的