Returns a range of characters from string for lengthExpr characters

Synopsis

• csubstr string firstExpr lengthExpr

Description

Returns a range of characters from string starting at the character indexed by the expression firstExpr (zero-based) for lengthExpr characters.

If the expression firstExpr or lengthExpr starts with the string end, then end is replaced with the index of the last character in the string. If the expression starts with len, then len is replaced with the length of the string.