What Regular Expression do I need to match "3213.32.2311" and similar?

I want a regular expression to match input like:

3213.32.2311

Format required is:

• Four numeric characters
• a .
• 2 numeric characters
• a .
• 4 numeric characters.

Get yourself a regex cheatsheet such as http://www.regular-expressions.info/reference.html

^\d{4}\.\d{2}\.\d{4}$

Try: \d{4}\.\d{2}\.\d{4}

\d{4}\.\d{2}\.\d{4}