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Tip of the Day
Language: VB7
Expertise: Intermediate
Mar 31, 2003

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IsValidIP - Validating an IP address

' Validate an IP address
' Example:
'   MessageBox.Show(IsValidIP("123.14.0.255")) ' => True
'   MessageBox.Show(IsValidIP("256.14.0.255")) ' => False

Function IsValidIP(ByVal ipAddress As String) As Boolean
    Return System.Text.RegularExpressions.Regex.IsMatch(ipAddress, _
        "^(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}$")
End Function
Marco Bellinaso
 
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