Skip to main content

Introducing Code Hinting for Regular Expressions

It's been a long time in the making but code hinting is here, and I'm pretty excited about it.

Regex Code Hinting

I've created a short code hinting demo that shows it off a bit. This feature is available only to licensed users. If you're a licensed user and you open up the tester now you'll see hints appear as you start typing an open parenthesis "(", bracket "[" or brace "{".

I took a lot of inspiration from Intellisense. In particular, I based my design off of the Intellisense in Expression Blend. I like the look & feel of Expression Blend. But the regular expression language is so different than anything Intellisense is used for. So functionality-wise I was on my own.

I knew one thing I didn't want. I didn't want the code hinting to aggressively autocomplete. In other words, Intellisense in Visual Studio will sometimes autocomplete whatever you're typing at the time, sometimes adding code that you don't even want. That's a side effect of their complex algorithm that's normally pretty good. However, the regular expression syntax is tricky. And I have this theory. Most people can't write regular expressions as quickly and easily as .NET. So attempting aggressive auto-completion doesn't make much sense when the user may not know what they're looking for until they see it in the description. I fear that if Regex Hero tries too hard to predict what you're going to type before you type it then it'll inevitably make mistakes.

So I've made it impossible for the code hinting to do anything you don't want it to. You literally have to select the pattern from the list to add it to your regular expression. You can do that either by using the arrow keys to move to it and hitting enter or tab to select it, or by double clicking the pattern. I think this still makes the code hinting easy to use, but without all the fuss of accidental code modification. In my humble opinion, the end result is pretty awesome. It's a beautiful addition that allows you to be even more productive. And if it saves you from having to look up something in the reference then I've done my job.

I still want to add a few patterns to the mix and make it work with replacement patterns as well. But for now I think it's ready for primetime and I'd love to hear your thoughts.

Comments

Popular posts from this blog

Regex Hero for Windows 10 is Underway

Awhile back I began working on an HTML5 / JavaScript version of Regex Hero . However, it was a huge undertaking essentially requiring a complete rewrite of the entire application. I have not had enough time to dedicate to this lately. So I've begun again, this time rewriting Regex Hero to work in WPF. It'll be usable in Windows 10 and downloadable from the Microsoft Store. This is a much easier task that also has the advantage of running the .NET regex library from the application itself. This will allow for the same speedy experience of testing your regular expressions and getting instant feedback that Regex Hero users have always enjoyed. I expect the first release to be ready in Q4 of 2019.

Optimizing Your Regular Expressions

Regular expressions will backtrack.  That's an unfortunate thing about them because backtracking can be slow.    And in certain (rare) cases the performance can become so awful that executing the regular expression against a relatively short string could take over a minute.  There's a good article about catastrophic backtracking over at regular-expressions.info . And today I created a video about all of this called  Regex Lesson 5: Optimization .  In the video I start with a very poorly written regular expression and make several improvements to it, using the benchmarking feature along the way.  By the end of the video I make the regular expression over 3 million times faster. In addition, today's update to Regex Hero provides a little message in the event that you encounter a regular expression that takes over 10 seconds to evaluate... And then last of all, I changed the benchmarking feature a bit.  In the past it would simply test your regular expression against

Installer for Desktop version of Regex Hero

As Firefox just dropped support for Silverlight I really needed a solution for Regex Hero. So I created an installer for it. It's still Silverlight, but by using the installer you can install it directly to your computer and never need to open it in a browser. If you visit regexhero.net/tester and don't have a browser that supports Silverlight (IE is the only one left), then you'll see download links for 64-bit and 32-bit versions of the installer. When you install it you'll see a link over on the right hand side that says "Activate Regex Hero". This process connects your desktop version of Regex Hero with your online account. So if you're a licensed user this is how you'll gain access to all of those licensed features. Note: Currently there will be a security warning when you try to run either one of these installers. I'm in the process of obtaining a code signing certificate and will update them as soon as possible. You may be wondering a