substring() Operation

Syntax	`set aSubstring = aString.substring(startIndex, length)` `set aSubstring = substring(LITERAL, startIndex, length)`
Semantics	Extracts a substring of a given length beginning at position `startIndex`. Returns a new string. The state of the current string is not changed. If length is greater than the length of `aString`, an error is raised.
Substitutables	`aString`	Can be any variable or object attribute having the type String.
	`startIndex, length`	Can be any variable or object attribute having the type Integer. The start index cannot be negative.
	`LITERAL`	String literal.
Examples	NONE `set aSubstring = s1.substring(0, 2); // To get the last 5 characters of a string set endOfString = astring.substring(aString.length(-5), 5);`

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