Update regex of email validation

[AlaaElattar]

• Email validation is not working correctly #541
• Update verification to ensure that there’s a dot followed by at least two letters at the end, which prevents invalid entries like aa@aa.

Tested Scenarios:

All the following cases will be rejected by regex:

• aa@aa
• user..name@gmail.com
• username@domain-.com
• username@-domain.com
• .user@gmail.com
• user.@gmail.com

[zaelgohary]

The regex accepts the following invalid scenarios:

• Two or more consecutive dots in the local part

• Invalid max length

• Hyphens at invalid positions in the domain

• Leading or trailing dot in the local part

[AlaaElattar]

[zaelgohary]

Can we use email validator instead of regex?