Read vars from a text file

Hi,

I need to read an ip-adress from a text file.

The line in the text-file is formatted as:

...
ip:192.168.0.1 //Comment
...

I know how to read the file, but how do i only read the ip-adress and not the rest of the line. And how do i validate that it has the proper format for an ip-adress?

Thanks

// Martin

What version of the jdk are you using? (Hint: it's a whole boat-load easier if you can use 1.4)