C ++ 11 standard STL Regular Expression verification email address

the most common verification is email address verification. Websites are common. Various web scripts also use regular expressions ( Regular Expression ) verify the email address we entered to determine whether the email address is valid. Some can also separate the username and domain name. Use C ++ implements the email address verification Program , C ++ 11 Standard STL regular expression.

Source codeAs follows:CodeAlready inVisual Studio 2010.G ++ 4.6Not SupportedC ++ 11OfSTLRegular Expression,G ++ 4.6Can be compiled on, but the runtime error is thrownRegex_errorException. Therefore, if you wantG ++ 4.6Use a regular expression.GNURegular Expression library orBoostRegular Expression Library.

 /*  * RegEx. CPP-use regular expressions to verify the email address ** C ++ 11 standard STL Regular Expression *** copyright ye Jianfei 2012 ** compilation command: * Cl RegEx. CPP/ehs/ link/out: regex.exe * */  # Include <Iostream> # Include <Cstdlib> # Include <String> # Include <RegEx> //  Regular Expression  Using   Namespace  STD;  Int  Main (){  String  Email_address; String  User_name, domain_name; RegEx pattern (  "  ([0-9a-za-z \-_ \.] +) @ ([0-9a-z] + \\. [A-Z] {2, 3 }(\\. [A-Z] {2 })?)  "  );  //  Regular Expression, matching rules:  //  Group 1 (username), matching rules: 0 to 9, A to Z, A to Z, underline, dot, and hyphen  //  Any character of, repeated once or more  //  In the middle, a "@" symbol  // The second group (that is, the domain name), matching rules: 0 to 9 or any character in A to Z repeat or above,  //  Next, any character in A to Z should be repeated 2 to 3 times (such as com or CN ),  //  A group in the second group, a vertex, and any character from A to Z Repeat twice (such as CN or fr)  //  The entire group is repeated for zero or one time.  //  Enter the file terminator (CTRL + Z for Windows and CTRL + D for UNIX) to end the loop.      While (CIN> Email_address ){  If  (Regex_match (email_address, pattern) {cout < "  The email address you entered is valid.  " < Endl;  //  Intercept Group 1 User_name = regex_replace (email_address, pattern, String ( "  $1  "  ));  //  Intercept Group 2 Domain_name = regex_replace (email_address, pattern,String ( "  $2  "  ); Cout < "  User name:  " <User_name < Endl; cout < "  Domain Name:  " <Domain_name < Endl; cout < Endl ;} Else  {Cout < "  The email address you entered is invalid.  " <Endl < Endl ;}}  Return  Exit_success ;}