Regex question

I'm trying to match hostnames from a DNS zone file. Here's a sample line:

host.domain.com. A 192.168.0.1


How do I match just "host.domain.com"? That is, what regex would I use?

Thanks,
-KB

re: Regex question

You need to more explicitly state what you're trying to do. Are you trying to simply see if this "specific" hostname is within a line. Are you trying to extract the hostnames? And they are always the first item in the record? There are many different types of goals that would require a different regular expression, but since you didn't specify, I'll simply assume the easiest.

All that does is search for the literal string "host.domain.com" with word boundaries surrounding it. If you need help with anything more specific, you'll have to specify.

re: Regex question

Sorry, miller.

Yes, I will extract only the hostnames and they will be the 1st item in the record.

Okay, I saw that you used the word boundary -- I didn't think to use that. :)

Thanks!!

re: Regex question

If all you're trying to do is extract the first element from the line, then I suggest simplifying your logic:

The above simply pulls all characters until a space is reached. It is the simpliest logic that you could use, and will therefore catch all your hostnames.