Will this regular expression work for IP validation?

See more:

regular-expression

I need a regular expression to verify that a string is an IP address. (It's not critical that it be a correct IP address; this is just a quick error check to make sure it's in that format.) This is what I have so far. Will it work all right?

^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$

The problem I can see is that it doesn't verify that each number is less than 256 (eg, you could enter 999.999.999.999), but I don't know how to combine regular expressions with mathematical ones, and I consider that more of a "room for improvement" situation than a critical problem.