Php regular expression verification email _ PHP Tutorial

Php regular expression verification mailbox. Mailbox verification code is mostly a domain name or a letter user name that cannot be verified by a letter, such as: I @fufuok.com or fufu@9.cn. The solution is as follows: 1, do not judge the total length, the length of the Mail authentication code is mostly not to verify a letter of the domain name or a letter of the user name, such as: I @fufuok.com or fufu@9.cn. The solution is as follows:

1. do not judge the total length. you can add the total length;

2. supports domain name suffixes such as .net.cn and .com.cn;

3. the mailbox name must start with a letter or number and can contain "-" and "_" in the middle;

4. the domain name must start with a letter or number, with the "-" and "_" characters in the middle;

PHP email verification regular expression

The code is as follows:
Preg_match ("/^ [0-9a-zA-Z] + @ ([0-9a-zA-Z] +) [.]) + [a-z] {2, 4} $/I", $ email );

Instance

The code is as follows:

/** * A self-edited regular mailbox expression * Qiongtai blog */ Echo' '; Function c_email ($ email ){ $ Reg = '/^ ([a-zA-Z0-9] {}) ([_-.])? ([A-zA-Z0-9] {}) * @ ([a-zA-Z0-9] {}) ([-_])? ([A-zA-Z0-9] {}) * (. [a-z] {2, 4}) {1, 2} $ /'; If (preg_match ($ reg, $ email )) Return true; Return false; } $ Email = 'mail @ lizhong. me '; $ Check_result = c_email ($ email ); If ($ check_result ){ Echo 'mailbox format is correct '; } Else { Echo 'mailbox format error '; }

Email verification

The code is as follows:
Class Reg { Public $ mail; Function _ construct () { $ This-> mail =$ _ POST ["mail"]; } Function RegMail () { If (preg_match ("/^ [0-9a-zA-Z] + (? : [_-] [A-z0-9-] +) * @ [a-zA-Z0-9] + (? : [-.] [A-zA-Z0-9] +) *. [a-zA-Z] + $/I ", $ this-> mail )) { Echo"