The HLA Standard Library contains hundreds of string and pattern-matching functions you may find useful. All of this appears in source form at http://www.artofasm.com/ or http://webster.cs.ucr.edu/; you should check out some of that source code if you want to see some examples of string instructions in action. Note also that some of the HLA Standard Library routines use discrete instructions to implement certain high-performance algorithms. You may want to look at that code as an example of such code. The 16-bit edition of this book (which appears on the website) discusses the implementation of several character-string functions using the 80x86 string instructions. Check out that edition for additional examples (those examples do not appear here because of the performance problems with the string instructions). Finally, for general information about string functions, check out the HLA Standard Library reference manual. It explains the operation of the string and pattern-matching functions found in the HLA Standard Library.