I thought I should share a component I whipped together for ActionScript 3 projects in Flash that allows you to easily monitor memory usage and framerate. It’s simple, unobtrusive, and only adds 0.5kb to your SWF.
It’s only about 5 lines of code, but it’s handy to have kicking around your component panel for quick access.
I’ve always wanted to say that, even if it is a bald-faced lie.
While in Tokyo I had the distinct pleasure and honour of being interviewed by Director’s Magazine. The interview, and a rather silly looking photo of me appeared in the Aug-Sep edition of the magazine. I just got a copy (bit of a delay, but hey, it came all the freaking way from Japan, man!), and while I have no idea what it says, it’s still pretty cool, so I wanted to post it for posterity.
Here’s a scan of the picture page:
Update: Adobe has added the Loader.unloadAndStop method to Flash player 10 to address some of the issues outlined in this article. You can find more details on this feature in my article “Additional Information on Loader.unloadAndStop“.
Flash Player 9 has a very dirty secret. It doesn’t even try hide this dirty secret, but it’s still not that widely known. You see, Flash Player has severe problems with separation anxiety – once it’s loaded some content, it has a really hard time ever letting it go. Technically speaking, it is extremely difficult to make Flash Player 9 unload ActionScript 3 content.
In this article, I’ll take an in-depth look at the issue, it’s implications, suggestions for addressing the problem in the player, and some workarounds for the time being. If this issue seems like it will impact your projects, I’d strongly encourage you to read through the article and educate yourself, then use the link at the end of the article to provide Adobe with feedback on it. Likewise, I would encourage you to share this issue with other developers, both to help spread awareness of the issue, and to give them the opportunity to also provide feedback to the Flash Player team. I see this as one of the most critical issues that should be solved in Flash Player 10, and the more people raise it as an issue with Adobe, the more likely it is to be addressed.
This will be the last RegExr related post for awhile, I promise! I’m just having a lot of fun playing around with this.
I just uploaded version 0.2.1b of RegExr. This version includes support for using replace with regular expressions, including replacement codes (ex. $& is replaced with the RegExp match substring). Even better, I wrote a full RegEx lexer / tokenizer, so that RegExr understands the expressions you write at the token level. This allows it to provide accurate capturing group reports, nested token highlighting including display of errors, and contextual information on tokens as you roll over parts of your regular expression.
These new features make it way easier to learn regular expressions if you’re just starting out.
I just uploaded the desktop version of RegExr. It’s just an AIR version of the online application for now, but I’ll add some desktop specific features, and put up a nicer looking page when I have a chance.
With this morning’s announcement of the AIR alpha for Linux, this means RegExr is now the first free tool for editing and testing regular expressions (RegEx) that runs on Mac OSX, Windows, Linux, and online (as far as I can determine). Pretty cool, considering it only took 60 minutes of work to convert the online application to a desktop program and add update notifications.
You can install the desktop version of RegExr here. Or, you can use the online version at regexr.com.
Next up, I plan to add support for testing replace functions, and then a proper lexer.
I just released a new version of RegExr, the free online application for learning and testing regular expressions. This release includes a number of minor bug fixes, and a few big new features.
Real-time expression editing
Matches are now displayed in real-time as you edit your expressions.
Code sense
This build has early support for displaying inline code tips when you mouse over your expression.
Infinite match notification
The expression will now turn red if it will result in infinite matches.
New URL
You can now access RegExr at RegExr.com. This simply redirects to its permanent home at gskinner.com/RegExr/.
If you encounter any problems, have a feature request, or want to provide feedback, please leave a comment below.
Known issues:
The group pre-parser doesn’t do a very good job with nested groups. This only affects the group listing in the info field (bottom), not code sense or the groups listing for matches.
Code sense support is very early, and will likely have some quirks. Please let me know of any issues in the comments below.
RegExr is an online tool for editing and testing Regular Expressions (RegExp / RegEx). It provides a simple interface to enter RegEx expressions, and visualize matches in real-time editable source text. It also provides a handy RegExp snippet sidebar with descriptions and usage examples to make it easier to learn Regular Expressions through trial and error.
It isn’t as powerful as a product like RegExBuddy, but it has the advantage of being online and free. I will be releasing a free desktop version for Mac OSX and Windows built with AIR in the next day or two.
So far this has only taken a day of development, and the main app is only 150 lines of code. Flex 3 makes this kind of app so darn simple to put together.
RegExr is built with Flex 3, and uses ActionScript 3’s built in RegExp engine. As with most engines, the AS3 RegExp implementation isn’t perfect, so you are likely to encounter some limitations and oddities. Likewise, RegExr is very much beta software (did I mention it was developed in a day?), and currently has no error handling whatsoever, so it’ll probably have a few quirks of its own.
RegExr uses an extension of the TextHilighter class that comes with the Spelling Plus Library. We will be including the RegExpHighlighter class with a future release of SPL.
Here’s some quick code to parse individual tags and text elements out of an html string. It might be handy for some people, but it’s also a good example of some advanced RegExp. Note that you could also do this by parsing it to XML, and traversing with E4X.
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