Fixed #2438 isEmail Issue

[Vinayak-Nevge]

#2445 fixed(isEmail): Correct validation for invalid characters in quoted strings

This PR addresses the issue described in issue #2438, where email addresses with invalid characters such as * and . enclosed within double quotes were incorrectly validated as valid. The isEmail function's regular expression for quoted strings was updated to comply with RFC 5321, allowing only valid characters within quotes.

**References

• Issue: [validator.js issue Email Validator issue for double quotes and special characters #2438]
• RFC 5321: Internet Message Format

Checklist

• PR contains only changes related to the issue.
• Tests updated to cover new cases (emails like "example*."@gmail.com are now rejected).
• References provided in PR.

[gshpychka]

This PR addresses the issue described in #2438, where email addresses with invalid characters such as * and . enclosed within double quotes were incorrectly validated as valid.

They're correctly validated as valid, though - why do you say it's incorrect? https://en.wikipedia.org/wiki/Email_address#Local-part