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.
Look at these: http://www.webcheatsheet.com/php/regular_expressions.php http://www.catswhocode.com/blog/15-php-regular-expressions-for-web-developers
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.
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