Question: How to handle substrings in a string with special characters?

Dear Maple users

As a followup on my recent question about how to count the number of characters in a string containing special Danish characters here:

I also need to handle substrings from a string in my work in Cryptography. In my attached file I present an example with a string containing two special characters. The problem is however, that I need to access individual characters in the string. Normally I would do so by using the command substring. As indicated in the file it doesn't work very well, because the special characters are represented by TWO elements (bytes)!

Is there a smart way to create a new command named SUBSTRING to accompanying the great LEN command suggested by vv?


Erik V.

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