PHP正則驗證Email的方法

 　　本文實例講述了PHP正則驗證Email的方法。分享給大家供大家參考。具體如下：

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 <?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 with '.' $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,"A"))) { // domain not found in DNS $isValid = false; } } return $isValid; } ?>

　　希望本文所述對大家的php程序設計有所幫助。