How does the regular expression and URL stuff work?
Regular expressions are a powerful, concise way of parsing strings. There is plenty of information on them available on Google. Every regular expression defined in Track Package must have a corresponding URL. When the regular expression is matched to a string, that string is used, along with the URL information stored for the matched carrier, to build the final website URL. Each carrier has two pieces of URL data, a front and a back. The final URL is constructed as follows: URLFront + matchedString + URLBack. Note that a URL for a carrier can be specified without specifying a matching regular expression. In this case, the carrier will only be supported in “non-smart-sense” mode. However, every regular expression specification must have a matching carrier URL in the URL window (and the carrier’s case must match between the two).
