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  • 1. Hashim Naseer Lokasher Muazzam Ali Sundhu Haseeb Mehmood Gohar Naseer Muhammad Qasim Ali 11014119-129 11014119-099 11014119-089 11014119-087 11014119-128 THEORY OF AUTOMATA PROJECT TITLE: EMAIL VALIDATOR
  • 2. Introduction Email Validator
  • 3. Email Validator What does Validation means?
  • 4. Validation Validation is the process of checking data against a standard or requirement. The term is commonly used when: Checking the information entered by a person when storing data, sending information or using an online service (FORM VALIDATION).
  • 5. Email Validation So, Email Validation means to validate and check an email address.
  • 6. Our Project Is a email validator, which Validates an Email Address Check the grammar and syntax Can be used in Data Entry forms and Applications
  • 7. Screenshot C# Programming Language is used for the development of this application. WinForm and Regular Expressions class is also used
  • 8. Program Working Email Validator
  • 9. So, What is a Valid Email Address?
  • 10. Valid Email Address There's only one real answer to this: A valid email address is one that you can send emails to Contemporary email addresses consist of a "local part" separated from a "domain part" (a fully-qualified domain name) by an at-sign ("@"). Mymail@mycompany.com is a valid Email Address
  • 11. Regular Expressions  If you only want to check if an address is grammatically correct then you could use a regular expression  Using a regular expression that recognizes email addresses could be useful in various situations: For example to scan for email addresses in a document, to validate user input, or as an integrity constraint on a data repository.
  • 12. Regular Expressions Regular expressions are a very cool feature for pattern recognition in strings. Mathematically speaking regular expressions are parsed through a "finite state machine". As the name implies, such a machine has only a finite number of states, and it has no external memory attached.
  • 13. Parsing Parsing or syntactic analysis is the process of analysing a string of symbols, either in natural language or in computer languages, according to the rules of a formal grammar.
  • 14. Regular Expression Processor A regular expression processor processes a regular expression statement expressed in terms of a grammar in a given formal language, and with that examines the target text string, parsing it to identify substrings that are members of its language, the regular expressions.
  • 15. "^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+$"
  • 16. Regular Expression for Email Validation Myname@mycompany.com can be validated as "^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+$" Myname @ mycompany . com We compared the given email address with the upper RegEx to validate it is synthetically correct or not.
  • 17. Regular Expressions Any validation problems that involve recursion, option, limitation is easier to solve with regular expressions than using other ways (like if-else if-else, while condition)
  • 18. Regular Expressions Regular Expressions can be used to Test if a string matches some pattern. Scan for virus signatures. Process natural language. Search for information using Google. Search for markers in human genome Search-and-replace in a word processors. Validate data-entry fields (dates, email, URL, credit card)
  • 19. Email Address Standards There are acknowledged standards for what constitutes a valid email address. These are defined in the Request For Comments documents (RFCs) The syntax of email addresses has been defined in various RFCs, most notably RFC 822 and RFC 5322. We u s e d R F C 5 3 2 2 , a s t h i s i s t h e l a t e s t s t a n d a r d .
  • 20. Code Snippet string pattern = @"^[a-z][a-z|0-9|]*([_][a-z|0-9]+)*([.][a-z|" + @"0-9]+([_][a-z|0-9]+)*)?@[a-z][a-z|0-9|]*.([a-z]" + @"[a-z|0-9]*(.[a-z][a-z|0-9]*)?)$"; System.Text.RegularExpressions.Match match = Regex.Match(textBox1.Text.Trim(), pattern, RegexOptions.IgnoreCase);
  • 21. Finite State Machine
  • 22. ANY Question?
  • 23. Thanks