Regular Expression to match IP address + wildcard

Question

I\'m trying to use a RegularexpressionValidator to match an IP address (with possible wildcards) for an IP filtering system.

I\'m using the following Regex:

Answer 1

My answer is general for .NET, not RegularExpressionValidator-specific.

Regex string for IP matching (use ExplicitCapture to avoid useless capturing and keep RE concise):

"\\b0*(2(5[0-5]|[0-4]\\d)|1?\\d{1,2})(\\.0*(2(5[0-5]|[0-4]\\d)|1?\\d{1,2})){3}\\b"

Depending on particular use case you may want to add appropriate anchors, i.e. \A or ^ at the beginning and \Z or $ at the end. Then you can remove word-boundaries requirement: \b.

(Remember about doubling \ inside the string)