PHP Regular Expression verification Email Method

PHP Regular Expression verification Email Method

This article describes the PHP Regular Expression verification Email method. Share it with you for your reference. The details are as follows:

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<? Php Function validateEmail ($ email) { $ IsValid = true; $ AtIndex = strrpos ($ email ,"@"); If (is_bool ($ atIndex )&&! $ AtIndex) { $ IsValid = false; } Else { $ Domain = substr ($ email, $ atIndex + 1 ); $ Local = substr ($ email, 0, $ atIndex ); $ LocalLen = strlen ($ local ); $ DomainLen = strlen ($ domain ); If ($ localLen <1 | $ localLen> 64) { // Local part length exceeded $ IsValid = false; } Else if ($ domainLen <1 | $ domainLen> 255) { // Domain part length exceeded $ IsValid = false; } Else if ($ local [0] = '.' | $ local [$ localLen-1] = '.') { // Local part starts or ends '.' $ IsValid = false; } Else if (preg_match ('/\. \./', $ local )) { // Local part has two consecutive dots $ IsValid = false; } Else if (! Preg_match ('/^ [A-Za-z0-9 \-\.] + $/', $ domain )) { // Character not valid in domain part $ IsValid = false; } Else if (preg_match ('/\. \./', $ domain )) { // Domain part has two consecutive dots $ IsValid = false; } Else if (! Preg_match ('/^ (\\\\. | [A-Za-z0-9! # % & '_ =\\/ $ \' * +? ^ {} | ~. -]) + $/', Str_replace ("\\\\", "", $ local ))) { // Character not valid in local part unless // Local part is quoted If (! Preg_match ('/^ "(\\\\" | [^ "]) +" $/', str_replace ("\\\\","", $ local ))) { $ IsValid = false; } } If ($ isValid &&! (Checkdnsrr ($ domain, "MX") | checkdnsrr ($ domain, ""))) { // Domain not found in DNS $ IsValid = false; } } Return $ isValid; } ?>

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