Let's say I want to make a special case for a function that matches strings that start with the character 'Z'. I could easily do it using pattern matching by doing something like the following:
myfunc ('Z' : restOfString) = -- do something special
myfunc s = -- do the default case here
But what if I want to match strings with a longer prefix? Say I want to have a special case for strings that start with the word "toaster". What's the best way to write a pattern to match such a string?