Email Regex that works 99.99%
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Email Regex that works 99.99%
1–10 of 65 posts
Re: Email Regex that works 99.99%
#2[deleted]
Re: Email Regex that works 99.99%
#3This would be valuable only with a proper test suite, nothing fancy but two files with valid and invalid addresses. I don't trust these and very hard to debug a complex regex, it's wway easier to argue about test cases.
Re: Email Regex that works 99.99%
#4I simply don't validate emails up front anymore. The only thing I check for is if the string contains an @-char, I only do that to be nice if it's left out by accident. Instead of having a monstrous regex pattern in my code I simply email a confirmation link the user must confirm.
Re: Email Regex that works 99.99%
#5Utterly pointless. An email regex tells you that the email address (probably) conforms to a pattern that means it might be a valid email address (for now, until new weird TLDs emerge and the patterns have to change...), but it has no way of telling you whether that address can actually receive mail. `foo@bar` fails these regular expressions and `foo@bar.invalid` passes them, but neither will receive mail.
As I have told people for many years: if you must do this, check at most if there's an @ and (perhaps) a dot somewhere after the @, which is enough to stop someone who has accidentally put their name in the email address field, or a similar user error. Anything else is a waste of brainwidth and will result in more problems than it solves.
Re: Email Regex that works 99.99%
#6I believe this falls under the category of "things that may be fun to play around with but should never be used in a real system".
Unfortunately, I bet there are thousands of "real systems" employing regexes like this... How many problems does this solve? Probably zero. How many does (/will) it cause? Probably much more than zero.
Re: Email Regex that works 99.99%
#7Utterly pointless. An email regex tells you that the email address (probably) conforms to a pattern that means it might be a valid email address (for now, until new weird TLDs emerge and the patterns have to change...), but it has no way of telling you whether that address can actually receive mail. `foo@bar` fails these regular expressions and `foo@bar.invalid` passes them, but neither will receive mail. As I have t…
It's a very good offline check. If that's not enough, you have to do online checking (DNS, RCPT TO, actual mail with confirmation link, etc.)
Re: Email Regex that works 99.99%
#8Utterly pointless. An email regex tells you that the email address (probably) conforms to a pattern that means it might be a valid email address (for now, until new weird TLDs emerge and the patterns have to change...), but it has no way of telling you whether that address can actually receive mail. `foo@bar` fails these regular expressions and `foo@bar.invalid` passes them, but neither will receive mail. As I have t…
It's excellent to extract email addresses from a text.
Re: Email Regex that works 99.99%
#9Utterly pointless. An email regex tells you that the email address (probably) conforms to a pattern that means it might be a valid email address (for now, until new weird TLDs emerge and the patterns have to change...), but it has no way of telling you whether that address can actually receive mail. `foo@bar` fails these regular expressions and `foo@bar.invalid` passes them, but neither will receive mail. As I have t…
The dot isn't mandatory either... There are also local (for example company internal) email services.
Re: Email Regex that works 99.99%
#10Utterly pointless. An email regex tells you that the email address (probably) conforms to a pattern that means it might be a valid email address (for now, until new weird TLDs emerge and the patterns have to change...), but it has no way of telling you whether that address can actually receive mail. `foo@bar` fails these regular expressions and `foo@bar.invalid` passes them, but neither will receive mail. As I have t…
Completely useful, as part of a two step process:1
1. Filter with the regex - what's left has a valid format, making step 2 much saner.
2. Extract and validate the domain name - super simple now, because the domain component is known to be sane.
(Optional but good idea 3: Handle exceptions....)
Step 1 is almost always the hardest part, now it's mostly done.