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IsValidIP ( IPaddress )

Checks if 'IPaddress' contains a valid IP address.

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Theo Ros - Show more from this author

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

/*------------------------------------------------------- Checks if 'IPaddress' contains a valid IP address. The given IPaddress should be in dotted format. Returns True (1) if IPaddress is valid, False (0) if not. An empty string also returns False. In: IPaddress - the dotted IP address as string Syntax: IsValidIP ( "192.168.0.1" ) Return type: Number (boolean) Theo Ros ----------------------------------------------------------*/ Let ( [ ip = Filter ( IPaddress ; "0123456789." ) ; iplist = Substitute ( ip ; "." ; "¶" ) ] ; // check if it was a dotted IP string with 4 triplets If ( TrimAll ( IPaddress ; True ; 3 ) <> ip or ValueCount ( iplist ) <> 4 ; False ; Let ( [ part1 = GetAsNumber ( LeftValues ( iplist ; 1 ) ) ; part2 = GetAsNumber ( MiddleValues ( iplist ; 2 ; 1 ) ) ; part3 = GetAsNumber ( MiddleValues ( iplist ; 3 ; 1 ) ) ; part4 = GetAsNumber ( MiddleValues ( iplist ; 4 ; 1 ) ) ] ; // now test if each triplet is a number => 0 and <= 255 part1 = Mod ( Abs ( part1 ) ; 256 ) and part2 = Mod ( Abs ( part2 ) ; 256 ) and part3 = Mod ( Abs ( part3 ) ; 256 ) and part4 = Mod ( Abs ( part4 ) ; 256 ) ) ) ) Click to copy

Checks if 'IPaddress' contains a valid IP address.
The given IPaddress should be in dotted format.

Returns True (1) if IPaddress is valid, False (0) if not. An empty string also returns False.

In: IPaddress - the dotted IP address as string
Syntax: IsValidIP ( "192.168.0.1" )

Return type: Number (boolean)

 

Comments

		Nick Lightbody, Deskspace Systems Limited Jul 6, 2010
Very useful, works as described, thanks Nick

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