在Javascript中使用正则表达式验证带有文件夹的电子邮件地址

Question

I am writing a regular expression to validate an email address in JavaScript.

/^[a-zA-Z]([\w-\.]{4,29})+@([\w-]+\.)+[a-zA-Z]{2,3}$/

This is working fine. But there came an additional requirement like " In a GMAIL address we can specify the folder name along with the email id to which the mail will be delivered. For ex. james+office@gmail.com , the mail will be delivered to the folder "office" under james@gmail.com's inbox.

So how can I validate that also in the above regex. The Plus symbol is not mandatory but if + is added it should be in between the other characters before @ symbol .

Answer 1

You can simply add the + character inside of your character class and use a negated match before the @ . Note that I removed the escape sequence from the dot and moved the hyphen as the last character, or else you need to escape it and also implemented the use of the i modifier for case-insensitive matching.

/^[a-z]([\w.+-]{4,29})[^+]@([\w-]+\.)+[a-z]{2,3}$/i

Live Demo

Answer 2

改用这个：

/^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?$/i

Answer 3

I tried this RegEx in the desired scenario you required and it worked fine

^([a-zA-Z0-9_\\-\\.\\+]+)@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.)|(([a-zA-Z0-9\\-]+\\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)$

Try it in RegEx Validator

Thanks, Hope it helps