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c# equivalent code for the script RRS feed

  • Question

  • Hello All, 

    I need below code equivalent in c#. Please help me

    import java.util.regex.*
    
        // regex'
        String SPCHARS   = "\\p{Cntrl}\\(\\)<>@,;:'\\\\\\\"\\.\\[\\]"
        String VARS     = "(\\\\.)|[^\\s${SPECIAL_CHARS}]";
        String QUOTSER     = "(\"(\\\\\"|[^\"])*\")"
        String WORD            = "((${VALID_CHARS}|')+|${QUOTED_USER})"
        String EMREGEX                = "^\\s*?(.+)@(.+?)\\s*\$"
        String USREGEX       = "\\s*${WORD}(\\.${WORD})*"
        

    Thanks in Advance

    Chandu





    Wednesday, January 9, 2019 11:08 AM

Answers

  • Hi  ,

    Thank you for posting here.

    According to your description, you want to convert java code to c#.

    Please refer to the following code.

    static bool checkemail(string email)
            {
                String EMAIL_REGEX = @"[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+";
                String USER_REGEX = @"[A-Za-z0-9\u4e00-\u9fa5]+";
                int? MAX_USERNAME_LEN = 64;
                try
                {
                    bool ismail = Regex.IsMatch(email, EMAIL_REGEX);
                    if (email.IndexOf('@')==-1)
                    {
                        return false;
                    }
                    else
                    {
                        string user = email.Substring(0, email.LastIndexOf('@'));
                        bool isuservalid = Regex.IsMatch(email, USER_REGEX);
                        bool lengthcheck;
                        if(user.Length>MAX_USERNAME_LEN)
                        {
                            lengthcheck = false;
                        }
                        else
                        {
                            lengthcheck = true;
                        }
                        return ismail & isuservalid & lengthcheck;
                    }
    
                }
                catch(Exception e)
                {
                    Console.WriteLine(e.ToString());
                    return false;
                }
            }

    Hope my suggestion could be helpful.

    Best regards,

    Jack


    MSDN Community Support
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    Thursday, January 10, 2019 5:19 AM
    Moderator
  • Evaluate this approach too:

    static bool checkEmails( string email )
    {
       try
       {
          new MailAddress( email );
          return true;
       }
       catch( FormatException )
       {
          return false;
       }
    }
    

    Thursday, January 10, 2019 12:48 PM

All replies

  • You can use the MSDN function IsValidEmail from How to: Verify that Strings Are in Valid Email Format
    Wednesday, January 9, 2019 11:12 AM
  • Hi  ,

    Thank you for posting here.

    According to your description, you want to convert java code to c#.

    Please refer to the following code.

    static bool checkemail(string email)
            {
                String EMAIL_REGEX = @"[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+";
                String USER_REGEX = @"[A-Za-z0-9\u4e00-\u9fa5]+";
                int? MAX_USERNAME_LEN = 64;
                try
                {
                    bool ismail = Regex.IsMatch(email, EMAIL_REGEX);
                    if (email.IndexOf('@')==-1)
                    {
                        return false;
                    }
                    else
                    {
                        string user = email.Substring(0, email.LastIndexOf('@'));
                        bool isuservalid = Regex.IsMatch(email, USER_REGEX);
                        bool lengthcheck;
                        if(user.Length>MAX_USERNAME_LEN)
                        {
                            lengthcheck = false;
                        }
                        else
                        {
                            lengthcheck = true;
                        }
                        return ismail & isuservalid & lengthcheck;
                    }
    
                }
                catch(Exception e)
                {
                    Console.WriteLine(e.ToString());
                    return false;
                }
            }

    Hope my suggestion could be helpful.

    Best regards,

    Jack


    MSDN Community Support
    Please remember to click "Mark as Answer" the responses that resolved your issue, and to click "Unmark as Answer" if not. This can be beneficial to other community members reading this thread. If you have any compliments or complaints to MSDN Support, feel free to contact MSDNFSF@microsoft.com.


    Thursday, January 10, 2019 5:19 AM
    Moderator
  • The following code library provides method to validate email addresses and goes into details how some approach are good vs bad, read the various "Strike" paragraphs as there are patterns that you may not have considered.

    In the unit test for the library the following are used to test against.

    namespace EmailAddressLibrary.Tests.CodeFool
    {
        using System.Collections.Generic;
    
        /// <summary>
        /// Examples borrowed from the CodeFool blog.
        /// http://codefool.tumblr.com/post/15288874550/list-of-valid-and-invalid-email-addresses
        /// </summary>
        internal static class Examples
        {
            internal static IEnumerable<string> Valid =
                new[]
                {
                    @"1234567890@example.com",
                    @"_______@example.com",
                    @"email@[123.123.123.123]",
                    @"email@example-one.com",
                    @"email@example.co.jp",
                    @"email@example.com",
                    @"email@example.museum",
                    @"email@example.name",
                    @"email@subdomain.example.com",
                    @"firstname+lastname@example.com",
                    @"firstname-lastname@example.com",
                    @"firstname.lastname@example.com",
                    @"""email""@example.com",
                    @"あいうえお@example.com",
                };
    
            internal static IEnumerable<string> Invalid =
                new[]
                {
                    @"#@%^%#$@#$@#.com",
                    @".email@example.com",
                    @"@example.com",
                    @"Abc..123@example.com",
                    @"Joe Smith <email@example.com>",
                    @"email..email@example.com",
                    @"email.@example.com",
                    @"email.example.com",
                    @"email@-example.com",
                    @"email@111.222.333.44444",
                    @"email@example",
                    @"email@example..com",
                    @"email@example.com (Joe Smith)",
                    @"email@example@example.com",
                    @"just""not""right@example.com",
                    @"plainaddress",
                    @"this\ is""really""not\allowed@example.com",
                    @"""(),:;<>[]@example.com",
                    @"email@123.123.123.123",
                };
        }
    }

    Basic usage

    using EmailAddressLibrary;
    
    EmailAddressValidator.Msdn("foo@bar.com");            // True
    EmailAddressValidator.ReferenceSource("foo@bar.com"); // True
    EmailAddressValidator.Haacked("foo@bar.com");         // True
    EmailAddressValidator.JStedfast("foo@bar.com");       // True


    Please remember to mark the replies as answers if they help and unmark them if they provide no help, this will help others who are looking for solutions to the same or similar problem. Contact via my Twitter (Karen Payne) or Facebook (Karen Payne) via my MSDN profile but will not answer coding question on either.
    VB Forums - moderator
    profile for Karen Payne on Stack Exchange, a network of free, community-driven Q&A sites

    Thursday, January 10, 2019 12:07 PM
    Moderator
  • Evaluate this approach too:

    static bool checkEmails( string email )
    {
       try
       {
          new MailAddress( email );
          return true;
       }
       catch( FormatException )
       {
          return false;
       }
    }
    

    Thursday, January 10, 2019 12:48 PM