RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).
Results update in real-time as you type.
Roll over a match or expression for details.
Save & share expressions with others.
Use Tools to explore your results.
Browse the Library for help & examples.
Undo & Redo with Ctrl-Z / Y.
Search for & rate Community patterns.

InfoByIp.com provides IP detection, geolocation and weather forecast. Both IPv4 and IPv6 are supported. Geolocation determines country, state and city of the IP address as well as latitude, longitude and altitude. In addition browsers properties are shown when displayed IP is the client IP. Browser properties include user agent, screen resolution and size, color depth, list of installed plugins, local time, java and flash support.