Is there any resource out there that covers regular expression in a very basic starter level? I have looked at http://www.regular-expressions.info/ but it is not exactly ‘quick reference’ friendly.. any other sources?
For me I mostly use it in php, so php friendly would be helpful.
When I was starting out with regular expressions I got recommended this book: Mastering Regular Expressions. It really helped me understand the basic concept and how regular expressions work. But also I can still learn from it today because it also covers more advanced topics.
There are some pdf versions of the books out there, but I don’t think they are legal. Otherwise I would really recommend buying this book if you really like to actually understand regexp and not just copy ready regexps and kind of understand how it works.
If you are on windows, you can use this program http://www.radsoftware.com.au/regexdesigner/
It’s mostly for .net but can apply to any regex scenario.
There’s a quick reference on the side and you can build and test your expressions.
Sams Teach Yourself Regular Expressions in 10 Minutes gave me a very good start. Everything about RegEx is not taught in 10 minutes but each different aspect of RegEx is broken in to easy to understand ~10 minute sessions.
To actually test RegEx’s, regexpal.com was awesome 🙂
Here is a very basic php tutorial
You may find also some online regex testers useful, where you can play around with regular expressions.
The best one I found out of these so far is http://www.addedbytes.com/download/regular-expressions-cheat-sheet-v2/png/ from Wesley Murch’s post above. I didn’t even think about searching for ‘cheat-sheet’ in google.. thanks!