[fpc-pascal] Test for valid ip address

[Mattias Gaertner]

On Thu, 28 Jul 2016 10:26:32 +0200
Jonas Maebe <jonas.maebe at elis.ugent.be> wrote:

> On 28/07/16 10:14, Koenraad Lelong wrote:
> > I need a way to test if an string containing an ipv4-address is really
> > an ipv4-address.
> > I tried
> > tmpAddress:=HostAddrToStr(StrToHostAddr(IPAddressStr));
> > writeln(tmpAddress);
> >  if (tmpAddress='0.0.0.0') then
> >   begin
> >    writeln('Error in IP-address');
> >    IPAddressStr:=tmpAddress;
> >   end;
> > When I enter 192.168.185.297 (i.e. not a valid ipv4 address) in
> > IPAddressStr I get
> > 192.168.185.41
> > not the expected error-message.  
> 
> You can add a multiple of 256 to any octet of an IPv4 address in most 
> programs. Try it in your browser, it will probably also work.

What browser supports that?

Mattias