Regular Expression

[Alvarion_Israel]

Hi,

I am trying to parse an IP address from a string, i am using this  :
[0-9]*.[0-9]*.[0-9]*.[0-9]*
but the * doesn't limit to 3 numbers, how can i do this parse?

[MikeS81]

Hi Alvarion,
which function do you use to parse your string? You can also have an IP adress, where all fields have only 2 numbers.

Mike

[Alvarion_Israel]

hey,

I want to use the Match Pattern vi and i to parse any combination of the ip address, with 2,3 or even 1.

[falkpl]

[0-9][0-9][0-9]\.[0-9][0-9][0.9] and so on.  dont have labview up right now but this should match 3 digits folowed by a period and repete the pattern until you have the 4 triplets needed for an ip address.

Paul

[falkpl]

sorry didnt put much thought in my last answer, this only matched 3 numbers.  You can use the optional escape clause for the 2nd and 3rd digit [0-9].

[Alvarion_Israel]

Thanks

[altenbach]

How about "String to IP" from the "communications..protocols...tcp" palette?

You should also be aware that each octet is U8 (0..255), so even if you limit to three digits, you could have problems, e.g. 300.400.500.600 is illegal.

[tst]

In addition to what Altenbach said, you might want to make a VI out of this with error I/O and validate the IP address in there. A very simple way of doing this is by using Scan From String with %d.%d.%d.%d as the format string and then checking the results using In Range & Coerce.

[Alvarion_Israel]

Thanks to you all

[falkpl]

Off hand I couldnt remember but the optional escape claues in RE is ? to matching 2 or 3 numbers becomes [0-9][0-9][0-9]? and batching a period is\.  it is all comming back to me now.

paul