Email validating regular expression Nsa meets chat room

Posted by / 11-Dec-2016 20:02

Making it more restrictive than that can often be a risk of invalidating some valid e-mails. :[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f] | \[\x01-\x09\x0b\x0c\x0e-\x7f])*") @ (? You'd be surprised at some examples of valid e-mail addresses. This will allow domain names with 2, 3 and 4 characters e.g.; us, tx, org, com, net, wxyz).On the final line we call test method for our regular expression and pass the email address as input.Often, email validation code for web applications checks only for the position of @ and period characters, also assuming the @ character will be in the front of period. Did you know you can use a Java Script Regular Expressions method to check email addresses?

"We see that [email protected] doesn't look like a email address are you sure it's right?

:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f] | \[\x01-\x09\x0b\x0c\x0e-\x7f]) ) \]) 1 I've used this technique multiple times. Also I suspect that soon all the "valid" emails that don't pass the check above (ie HTML5 validation) will be changed to be compatible with it.

The really long catch-all-edge-cases regex formats are daunting. True, some will fail, but it has the advantage that the same validation that happens on the browser is also used on the server side.

The fully compliant RFC-822 email regex is nothing to be trifled with; in fact, it is a behemoth.

As such, I recommend using only a simple regular expression for this task.

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"Some people, when confronted with a problem, think ' I know, I'll use regular expressions.' Now they have two problems."——Jamie Zawinski on regular expressions; paraphrasing the Unix Haters Handbook on As @Simon pointed out, your regular expression might consider some valid addresses as invalid.