Result = Subst ( Pattern , ReplaceString [, ReplaceString ])
Replaces arguments &1, &2, etc. in a pattern with the first, second, and subsequent ReplaceStrings respectively, and return the result.
If Pattern is null, then a null string is returned.
For C developers, this is not unlike a simplified sprintf.
Example :
PRINT Subst("Gambas is &1", "BASIC") => Gambas is BASIC