在php中地址验证写法各种各样的,下面我来总结几种常用的email地址验证实例,最简单的是直接使用正则表达式preg_match(\"/^([a-z0-9\\+_\\-]+)(\\.[a-z0-9\\+_\\-]+)*@([a-z0-9\\-]+\\.)+[a-z]{2,6}$/ix来验证了。

CodeIgniter框架邮件地址验证,代码如下:

1. /**
2. * Valid Email
3. *
4. * @access public
5. * @param string
6. * @return bool
7. */
8. function valid_email($str)
9. {
10. return ( ! preg_match("/^([a-z0-9+_-]+)(.[a-z0-9+_-]+)*@([a-z0-9-]+.)+[a-z]{2,6}$/ix", $str)) ? FALSE : TRUE;
11. }
12. PHPCMS邮件正则验证
13. 代码如下 复制代码
14. /**
15. * 判断email格式是否正确
16. * @param $email
17. */
18. function is_email($email) {
19. return strlen($email) > 6 && preg_match("/^[w-.]+@[w-.]+(.w+)+$/", $email);
20. }

WordPress邮件地址验证函数,代码如下:

1. function is_email( $email, $deprecated = false ) {
2. if ( ! emptyempty( $deprecated ) )
3. _deprecated_argument( __FUNCTION__, '3.0' );
4. // Test for the minimum length the email can be
5. if ( strlen( $email ) < 3 ) {
6. return apply_filters( 'is_email', false, $email, 'email_too_short' );
7. }
8. // Test for an @ character after the first position
9. if ( strpos( $email, '@', 1 ) === false ) {
10. return apply_filters( 'is_email', false, $email, 'email_no_at' );
11. }
12. // Split out the local and domain parts
13. list( $local, $domain ) = explode( '@', $email, 2 );
14. // LOCAL PART
15. // Test for invalid characters
16. if ( !preg_match( '/^[a-zA-Z0-9!#$%&'*+/=?^_`{|}~.-]+$/', $local ) ) {
17. return apply_filters( 'is_email', false, $email, 'local_invalid_chars' );
18. }
19. // DOMAIN PART
20. // Test for sequences of periods
21. if ( preg_match( '/.{2,}/', $domain ) ) {
22. return apply_filters( 'is_email', false, $email, 'domain_period_sequence' );
23. }
24. // Test for leading and trailing periods and whitespace
25. if ( trim( $domain, " tnrx0B." ) !== $domain ) {
26. return apply_filters( 'is_email', false, $email, 'domain_period_limits' );
27. }
28. // Split the domain into subs
29. $subs = explode( '.', $domain );
30. // Assume the domain will have at least two subs
31. if ( 2 > count( $subs ) ) {
32. return apply_filters( 'is_email', false, $email, 'domain_no_periods' );
33. }
34. // Loop through each sub
35. foreach ( $subs as $sub ) {
36. // Test for leading and trailing hyphens and whitespace
37. if ( trim( $sub, " tnrx0B-" ) !== $sub ) {
38. return apply_filters( 'is_email', false, $email, 'sub_hyphen_limits' );
39. }
40. // Test for invalid characters
41. if ( !preg_match('/^[a-z0-9-]+$/i', $sub ) ) {
42. return apply_filters( 'is_email', false, $email, 'sub_invalid_chars' );
43. }
44. }
45. // Congratulations your email made it!
46. return apply_filters( 'is_email', $email, $email, null );
47. }

下面分享一个自己写的实例,代码如下:

1. $email = "tanklo_--vehy@yahoo.com.cn";
2. function check_email($email) {
3. $pattern_test = "/([a-z0-9]*[-_.]?[a-z0-9]+)*@([a-z0-9]*[-_]?[a-z0-9]+)+[.][a-z]{2,3}([.][a-z]{2})?/i";
4. return preg_match($pattern_test,$email);
5. }
6. echo check_email($email);