So the question often arise, how to validate or extract an e-mail address using Regular Expressions in Perl? Written by Gabor Szabo.
Regexes Don’t Send Email
If you have any comments or questions, feel free to post them on the source of this page in GitHub. Gabor can help refactor your old Perl code-base. Home Questions Tags Users Unanswered.
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Asked 6 years, 4 months ago. Active 6 years, 4 months ago. Viewed 3k times. How to replace any last IP address octets four octet to 0 remark: Implementation should be by Perl one linear on linux machines for example Why do you need a Perl one-liner? It is not really in-place, it uses temporary files to achieve that effect. I try it but its not work as example: echo It's meant to take the list of IPs from a file.
I took your sample file and ran that, does you sample file have other characters in it? Trailing spaces etc?
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I actually tested this and it works fine. Funny how a different point of view can help make other code more efficient.
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Thanks again to all that responded. Jun 6 '07 9.
Email Address Regular Expression That % Works.
Right you are. However, I'm thinking that this might be one of those instances where including the logic to ensure that the number is greater than or equal to 0 is effectively just documentation. Yes, the regex would ensure this itself, but including that in the range test implies that he really means it to be 0 to and not Good eye, and your welcome. Jun 6 '07 Hi all, This works to validate IP. Jul 31 '07 First, a couple of things, in my opinion, wouldn't it be better to chomp the input and just remove the newline instead of chop ing off the last character and returning it?
Also, when entering code into the forum, always put the code between code tags. When you are typing up your response, see the "Reply Guidelines" off to the right for an example. If you don't, people like our friendly Moderator, Miller, have to come in behind you and edit your post to add them. As for your regex, while I am sure it works, WOW!!! I am not putting yours down in any way, please know that, but "Laziness, Impatience, and Hubris" aren't part of a Developer's life for nothing.
This works to validate IP. Greetings Velaga, That would indeed work for IP validation, and accomplishes the logic in single regex. If you wanted to shorten it some you could remove one of your or'd conditions by doing the following: Expand Select Wrap Line Numbers. Hi miller Thanks for beautifing code! Aug 1 '07 Sure do. You will want to read the perldoc page for the open function. In fact, you will find a lot of information on the perldoc site that will get you going if you look at the left hand navigation.
Read up the link that Jeff provided.
similar example
I personally make sure to use IO::File whenever I'm doing more than basic reading and writing. Hi miller How do we find non ascii characters using regualr expressions? Aug 16 '07 First, if you have an additional question that is not relevant to the current thread which was solved , then please post all new and additional questions to a new thread so they don't get lost. As for your question, you may want to go over to refcards.
Day 22 – Parsing an IPv4 address
That is a very good reference that I have hanging on my cubicle wall right in front of me. That does go over escape sequences for other chracters. May 23 '12