How to validate email address format?

In order to help your programming or testing tasks, FYIcenter.com has designed this online tool for you to validate any given email address using PHP regular expressions.

All you need to do is to enter an email address and click the "Validate" button. Validation result will be displayed in the result area.

Validation result by FYIcenter.com - Email Address:

Specified Emaill Address: Valid ✔

Email Address: "John Gate"@[10.0.3.19]
User Name: "John Gate"
Domain Name: [10.0.3.19]

What is a valid email address?

According to the Internet specification RFC 2822, there are several formats of valid email addresses, like john@host.net, john@[10.0.3.19], "John Gate"@host.net or "John Gate"@[10.0.3.19]. Many email address validators on the Web failed to recognize some of those valid email addresses.

Some examples of invalid email addresses are:

• john@box@host.net - Two at signs (@) are not allowed.
• .john@host.net - Leading dot (.) is not allowed.
• john@-host.net - Leading dash (-) is not allowed in on domain name.
• john@host.web - (web) is not a valid top level domain.
• john@[10.0.3.1999] - Invalid IP address.

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