It’s something that always mystifies me, it does seem that a lot of developers don’t know regular expression syntax very well. This came up when I was on some SharePoint 2013 training just before Christmas.
SharePoint 2013 introduces something called “Routing Rules”. These are rules that allow you to direct traffic to different front-end servers (or pools of servers), allowing you to isolate traffic, route to better health servers, etc.. Spence Harbar has a very good article about it.
Anyway, one some of the criteria that you can match rules on are Regular Expressions. However, SharePoint does warn you that Regex routing rules are slower – this is unsurprising. But how much slower than, say, a ‘Starts with’ or ‘Ends with’ rule? And on the Ignite training I did wonder about the efficiency of their example… Continue reading “The Importance of knowing Regular Expressions”