Php valid email regex

A classic question!

In PHP, you can use the following regular expression to validate an email address:

^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$

This regular expression matches most common email address formats, including:

Local part (before the @ symbol): one or more characters (letters, digits, dot, hyphen, underscore, percent, plus)
Domain (after the @ symbol): one or more characters (letters, digits, dot, hyphen)
Top-level domain (after the last dot): two or more characters (letters only)

Here's a breakdown of the regular expression:

^ matches the start of the string
[a-zA-Z0-9._%+-]+ matches one or more characters that are letters (both uppercase and lowercase), digits, dot, hyphen, underscore, percent, or plus
@ matches the @ symbol
[a-zA-Z0-9.-]+ matches one or more characters that are letters (both uppercase and lowercase), digits, dot, or hyphen
\. matches a dot (escaped with a backslash because dot has special meaning in regex)
[a-zA-Z]{2,} matches two or more characters that are letters only (the top-level domain)
$ matches the end of the string

You can use this regular expression in PHP like this:

$email = '[email protected]';
if (preg_match('/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/', $email)) {
    echo 'Valid email address!';
} else {
    echo 'Invalid email address!';
}

Note that this regular expression does not validate whether the email address actually exists or is in use. It only checks whether the format of the email address is valid.

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Php valid email regex