Here’s a list of specifications and coding references I have found useful in web development:
URL Regular Expression (Regex)
Here’s a regular expression to match URLs based on the RFC 3986. This example uses PHP.
[cc lang=”php”]
$scheme = “(https?)://”;
$userinfo = ‘([“+a-z0-9-._~+”]+(:[“+a-z0-9-._~+”]+)?@)?’;
$host = ‘([([0-9a-f]{1,4}|:)(:[0-9a-f]{0,4}){1,7}((d{1,3}.){3}d{1,3})?]|[“+a-z0-9-+”]+(.[“+a-z0-9-+”]+)*)’;
$port = “(:d{1,5})?”;
$path = ‘(/(([“+a-z0-9-._~!$&’ . “‘()*+,;=:@+” . ‘]|”+%[0-9a-f]{2}+”)+)?)*’;
$query = ‘(?(([“+a-z0-9-._~!$&’ . “‘()*+,;=:@+” . ‘”/”+”?”+”]|”+%[0-9a-f]{2}+”)+)?)?’;
$fragment = ‘(#(([“+a-z0-9-._~!$&’ . “‘()*+,;=:@+” . ‘”/”+”?”+”]|”+%[0-9a-f]{2}+”)+)?)?’;
[/cc] Continue reading URL Regular Expression (Regex)
Different Types of CAPTCHA
Recently I needed to improve CAPTCHA on a website. Here are the different types of CAPTCHAs I found.
- Web Service (Google reCAPTCHA)
- Locally-Run (Securimage PHP CAPTCHA)
- CSS (Honeypot / Invisible) CAPTCHA
- Video CAPTCHA (NuCAPTCHA)
- Math CAPTCHA (generate 2 numbers to add or something else only humans can evaluate and have them enter the correct value in another field)
Personally, the CSS CAPTCHA is the most elegant since users won’t even see any CAPTCHA field.
Documentary: Inside Job
Interesting documentary about the cause of the 2008 world economic crisis.
[youtube http://www.youtube.com/watch?v=FzrBurlJUNk]