Custom Form Validation in Magento

List of validate class And error messages :

      Class => Error Message
      1. validate-select => Please select an option.
      2. required-entry => This is a required field.
      3. validate-number => Please enter a valid number in this field.
      4.validate-digits => Please use numbers only in this field. please avoid spaces or other characters such as dots or commas.
      5. validate-alpha => Please use letters only (a-z or A-Z) in this field.
      6. validate-code => Please use only letters (a-z), numbers (0-9) or underscore(_) in this field, first character should be a letter.
      7. validate-alphanum => Please use only letters (a-z or A-Z) or numbers (0-9) only in this field. No spaces or other characters are allowed.
      8. validate-street => Please use only letters (a-z or A-Z) or numbers (0-9) or spaces and # only in this field.
      9. validate-phoneStrict => Please enter a valid phone number. For example (123) 456-7890 or 123-456-7890.
      10. validate-phoneLax => Please enter a valid phone number. For example (123) 456-7890 or 123-456-7890.
      11. validate-fax => Please enter a valid fax number. For example (123) 456-7890 or 123-456-7890.
      12. validate-date => Please enter a valid date.
      13.validate-email => Please enter a valid email address. For example johndoe@domain.com.
      14. validate-emailSender => Please use only letters (a-z or A-Z), numbers (0-9) , underscore(_) or spaces in this field.
      15. validate-password => Please enter 6 or more characters. Leading or trailing spaces will be ignored.
      16. validate-admin-password => Please enter 7 or more characters. Password should contain both numeric and alphabetic characters.
      17. validate-cpassword => Please make sure your passwords match.
      18. validate-url => Please enter a valid URL. http:// is required
      19. validate-clean-url => Please enter a valid URL. For example http://www.example.com or http://www.example.com
      20. validate-identifier => Please enter a valid Identifier. For example example-page, example-page.html or anotherlevel/example-page
      21. validate-xml-identifier => Please enter a valid XML-identifier. For example something_1, block5, id-4
      22. validate-ssn => Please enter a valid social security number. For example 123-45-6789.
      23. validate-zip => Please enter a valid zip code. For example 90602 or 90602-1234.
      24. validate-date-au => Please use this date format: dd/mm/yyyy. For example 17/03/2006 for the 17th of March, 2006.
      25. validate-currency-dollar => Please enter a valid $ amount. For example $100.00.
      26. validate-one-required => Please select one of the above options.
      27. validate-one-required-by-name => Please select one of the options.
      28. validate-not-negative-number => Please enter a valid number in this field.
      29. validate-state => Please select State/Province.
      30. validate-new-password => Please enter 6 or more characters. Leading or trailing spaces will be ignored.
      31. validate-greater-than-zero => Please enter a number greater than 0 in this field.
      32. validate-zero-or-greater => Please enter a number 0 or greater in this field.
      33. validate-cc-number => Please enter a valid credit card number.
      34. validate-cc-type => Credit card number doesn\’t match credit card type
      35. validate-cc-type-select => Card type doesn\’t match credit card number
      36. validate-cc-exp => Incorrect credit card expiration date
      37. validate-cc-cvn => Please enter a valid credit card verification number.
      38. validate-data => Please use only letters (a-z or A-Z), numbers (0-9) or underscore(_) in this field, first character should be a letter.
      39. validate-css-length => Please input a valid CSS-length. For example 100px or 77pt or 20em or .5ex or 50%
      40. validate-length => Maximum length exceeded.

How to add address field in magento customer registration form?

If you want to add address details in your form you are in luck. Those fields are already setup in the "template/customer/form/register.phtml" file, but they are disabled by an inactive if statement that so far has not actually been linked to anything else in Magento. Therefore to enable the address related fields you simply need to comment out or delete the following statements:

<?php if($this->getShowAddressFields()): ?>

and

<?php endif; ?>

Note that there are two occurrences of this if statement. One is around the area where the customer actually inputs their data  and the second statement is bottom of the file around some JavaScript code that sets up the State/Province select.