Skip to content

Latest commit

 

History

History
55 lines (48 loc) · 3.98 KB

Validation Rules & References.md

File metadata and controls

55 lines (48 loc) · 3.98 KB
Raw

Validation Rules

These are the validation rules which my program follows. These rules were created with careful research.

  1. Total length must be between 6 and 255 characters
  2. Address must contain an ‘@’ sign
  3. Quoting can be done by enclosing a label in double quotes (")
  4. Escaping may be done with a backslash before the character; an escaped backslash does not escape anything else
  5. Quotation marks must match unless escaped
  6. A quote may either occupy the entire local part, or occupy an entire label, separated by dots, inside the local part
  7. An @ sign must occur somewhere after the rightmost quote
  8. Quoted labels can include all characters, except for Tab, CR, LF, [, ] unless escaped
  9. Comments are indicated with parentheses
  10. Comments may be within comments, but any opening '(' must have a ')' to match
  11. Comments can occur at the start/end of labels or parts
  12. Characters within comment must follow the same rules as quoted labels, but square brackets are allowed
  13. There must be only one unquoted and uncommented ‘@’ sign
  14. The @ sign must have something before it and at least 4 characters after it
  15. Both the local part and the domain must not begin with a dot, end with a dot, or contain successive dots unless quoted/commented
  16. The local part must be between 1 and 64 characters
  17. The local part must not contain these characters: ) \ , : ; < > [ ] Tab CR LF unless they are quoted/commented
  18. The domain must be a maximum of 253 characters, minimum of 4
  19. The domain must contain at least one dot
  20. Labels (dot separated strings) must be 63 or less characters
  21. The domain must contain only alphabetical characters, digits, dots, and hyphens
  22. Labels in the domain must not begin with a hyphen, end with a hyphen, or contain successive hyphens
  23. Top level domain (everything after rightmost dot) must be more than one character
  24. The Top level domain must only have alphabetical and/or numerical characters
  25. Domain can be an ip address enclosed by square brackets “[“, ”]”: either IPv4 or IPv6
  26. Comments my occur before or after the square brackets, but not within the brackets
  27. IPv4 is 4 integers separated by dots
  28. The IPv4 integers must be under 256
  29. IPv6 (indicated with “IPv6:”) can be normal format or dual format
  30. Normal format is 8 hexadecimal values with 1 – 4 characters
  31. Hexadecimal values may have the letters a – f, and digits
  32. Dual IPv6 format is 6 hexadecimal values separated by colons “:”, followed by an IPv4 address
  33. IPv6 can contain “::” once, representing insignificant zeros (allowing for an undetermined number of parts less than 8/6)

References:

Akins, T. (n.d.). Email Validation Done Right. http://rumkin.com/software/email/ Clarke, B. (2021). eMail Validator Activity Outline. eMail Validator Activity Outline.pdf Comparing E-mail Address Validating Regular Expressions (2012). CN Blogs. https://www.cnblogs.com/hyqing/p/3421730.html Fuentes, E. (2019). IP address vs domain in an email address. https://www.serviceobjects.com/blog/ip-address-vs-domain-in-an-email-address/ Haack, P. (2007). I Knew How To Validate An Email Address Until I Read The RFC. http://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx/ Henderson, C. (n.d.). RFC 822 Email Address Parser in PHP. https://code.iamcal.com/php/rfc822/ Hinden, R. (2006). RFC 4291 - IP Version 6 Addressing Architecture. https://datatracker.ietf.org/doc/html/rfc4291 JavaScript form validation - checking email (n.d.). W3 resources. https://www.w3resource.com/javascript/form/example-javascript-form-validation-email-REC-2822.html Klensin, J. (2004). RFC 3696 - Application Techniques for Checking and Transformation of Names. https://datatracker.ietf.org/doc/html/rfc3696 Nagar, R. (n.d.). JMail Email Address Validation. https://www.rohannagar.com/jmail/ Resnick, P. (2008). RFC 5322 - Internet Message Format. https://datatracker.ietf.org/doc/html/rfc5322 Wikipedia. (2021). Email address. https://en.wikipedia.org/wiki/Email_address