CODEWITHSUNDEEP
javaregex
seleguy
seleguy

Reputation: 23

Email Regex validation

How can I restrict only numerics in the Email address. I tried below and it didn't work. My email should accept Alpha-numerics, dot, hyphen and underscore followed by "@AnyDomain.com". But it should not accept only numerics like "[email protected]"

Pattern regexPattern = Pattern.compile("^[(a-zA-Z0-9-\\_\\.!\\D)]+@[(a-zA-Z)]+\\.[(a-zA-Z)]{2,3}$");
Matcher regmatcher = regexPattern.matcher(email);

Upvotes: 2

Views: 2228

Answers (4)

Taslim Oseni
Taslim Oseni

Reputation: 6273

The regex below works for me every time for email verification. However, this might not solve all cases as emails accept a whole range of characters and more recently, different formats. If you're using the email for authentication, I would advise you send a verification email to confirm or add an extra mode of authentication.

/^[a-zA-Z.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/

Basically, the strength of a validation regex lies in the number of cases it can accurately capture while simultaneously checking for non-compliance (fakes). Each of these character sequences has a purpose in the overall validation process. You can learn more about regular expressions here.

Upvotes: 0

Moob
Moob

Reputation: 16214

Using regex for email can be problematic. Emails are not as simple as you think - there are many valid characters. Ideally you should let the browser do it input[type="email"] and send your users an activation email in order to prove that the email address is valid but I understand that there may be a legitimate need to validate the address on the server.

There's useful info here: https://stackoverflow.com/a/201378/1921385

Still need an rx?

According to https://emailregex.com/ the regex used by W3C to validate an input[type=email] is:

/^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/

So you could use this and just take out the number portion:

/^[a-zA-Z.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/

Have a play at regex101.com

Here's a demo:

input {border:10px solid red;}
input:valid {border-color:green;}
<input type="text" required="required" pattern="^[a-zA-Z.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$" placeholder="type=text, using a pattern" />
<input type="email" required="required" placeholder="type=email, no pattern here" />

Upvotes: 0

Govinda Sakhare
Govinda Sakhare

Reputation: 5726

I have modified regex the one provided in the question.

[a-zA-Z]+[(a-zA-Z0-9-\\_\\.!\\D)]*[(a-zA-Z0-9)]+@[(a-zA-Z)]+\.[(a-zA-Z)]{2,3}

I have added [a-zA-Z]+ at the beginning to ensure the email address doesn't start with numbers. If the email address can start with the special symbol, make sure you update it in the first block.

Upvotes: 0

abby37
abby37

Reputation: 647

You can use this regex to validate your condition

^\w*?[a-zA-Z]\w+@[a-z\d\-]+(\.[a-z\d\-]+)*\.[a-z]+\z

regex to validate above condition.

Upvotes: 2

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