I'm not very good with regular expressions, so I decided to seek some help.
Here's the regular expression I have:
/[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/;
It works for most cases of email validation, but it allows an undesired format through:
How can I modify the above Regular Expression to prevent consecutive periods anywhere in the string?
Thank you.
To prevent matching two consecutive dots, simply include a negative lookahead at the beginning of your regular expression:
/^(?!.*\.{2})[a-z0-9etc...
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This adjustment will cause the match to fail if there are two consecutive periods anywhere in the string, without needing any other changes to your original regular expression.
However, it may be better to reconsider using regular expressions for validating email addresses since your current approach appears to be flawed. You might want to explore alternatives like:
Avoid using email address validation with regex as it is prone to errors. While the email address may be functional in practice, it is technically invalid according to the relevant RFC guidelines.
Remember: relying solely on regex for validating email addresses can lead to inaccuracies.
// Effective email validation Regex^[A-Za-z0-9_%+-]+(?:\.[A-Za-z0-9_%+-]+)*@[A-Za-z0-9.-]+\.[A-Za-z]{2,}$This Regex is designed to prevent emails from starting or ending with a period, and also disallows consecutive periods and special symbols.
There's no need to reinvent the wheel ;)
Take a look at this link for more information:
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