Yogesh Chauhan's Blog

How to use [] (square brackets) function in Envision Basic?

in Envision Basic on December 24, 2021

The [] (square brackets) function helps extract or replace any strings.

Syntax

These are more like usages than syntaxes but we can use it like these:

Where

  • num.expr1 is the starting position for the operation.
    • It refers to the character position where the replacement or extraction operation occurs.
  • num.expr2 is the number of characters involved in the operation.
    • For an extraction, UniData returns that number of characters.
    • For a replacement, UniData replaces that number of characters.

str.expr [num.expr1,num.expr2] = expr

In the usage above, the square bracket function replaces part or all of str.expr.

OR


expr = str.expr [num.expr1, num.expr2]

In the usage above, the square bracket function extracts part or all of string.expr.

OR


expr = str.expr [num.expr1] 

In the first form, the function replaces part or all of string.expr. In the
second form, the function extracts part or all of string.expr

When a null value is passed a command parameter where a number is expected for e.g (num.expr1, num.expr2) and if you have null value handling ON, you’ll get a warning message and UniBasic will use 0 as the value.

Examples

Extract the first character of the variable

F.INITIAL will have “S” stored as its value.


FIRST.NAME = 'Sam'
F.INITIAL = FIRST.NAME[1,1]

Change the first letter of the word

The resulting string will be “Merry Christmas”.


TITLE = 'Merry Xhristmas'
TITLE[7,1] = 'C'


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