Pragmatically you can only assume it contains one @ and that there is at least one .
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Unless you are validating for a specific domain where the email naming policy is more structured.
BTW, please don't validate email addresses on the client-side.
indicates the minimum and maximum number of characters.
This will allow domain names with 2, 3 and 4 characters e.g.; us, tx, org, com, net, wxyz).
However, from a security standpoint, client side JS wouldn't protect you from XSS, SQL injection, or other vulnerabilities.
IMHO, it's best to do some basic validation on the front end so that your users don't lose the data they entered (EX: check for empty fields, validate phone numbers or SSN).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 can validate email address at client side and server side.: Finally, the email address must end with two to four alphabets.Having a-z and A-Z means that both lowercase and uppercase letters are allowed.Though this solution may be simple, I'm sure this is one of those useful things that people will be Googling for and deserves its own entry on the site If only Google would be the first place to look :) Just look at the duplicates of this closed every some time.