I was finishing up a project today and needed to parse one of my variables. I looked online and saw, from example, that substring-after would do what I wanted. Just to ensure I was using it correctly, I checked the documentation and got this:

"The substring-after function returns the substring of the first argument string that follows the first occurrence of the second argument string in the first argument string, or the empty string if the first argument string does not contain the second argument string."

After reading that I decided testing on my own would be the best bet. Good times.