regex.js

regex.js

/***** Fixed Phone Number Regex *****/

/*
  Fixed phone numbers' format:
  (district number)-(phone number) 
*/
var phoneRegex = /^(0[\d]{2,3}-)?[\d]{7,8}$/;

phoneRegex.test("020-82376643");  //=> true
phoneRegex.test("0755-6633868");  //=> true
phoneRegex.test("82394401");      //=> true

phoneRegex.test("122-82376643");  //=> false: district number must start with '0'
phoneRegex.test("823766443");     //=> false: phone number's length should be between 7 to 8.

/***** Mobile Phone Number Regex *****/

/*
  Mobile phone number has length of 11. 
  And the first 3 digits should be 13x, 15x, 18x, 147 or 170.
*/
var mobileRegex = /^(1[358]\d|170|147){1}\d{8}$/;

mobileRegex.test("13427525363");  //=> true
mobileRegex.test("15023656987");  //=> true
mobileRegex.test("134878923890"); //=> false

/***** Email Address Regex *****/

/*
  1. The completed and strongest(also the longest) one was introduced here: http://ex-parrot.com/~pdw/Mail-RFC822-Address.html
  2. While there's a must simpler RegExp which can cover most of common cases: http://www.regular-expressions.info/email.html
*/

/*
   TODO

   1. RFC 2822
   2. RFC 822
   3. RFC 5322
*/

/* REFERENCES

  1. Mail::RFC822::Address: regexp-based address validation: http://ex-parrot.com/~pdw/Mail-RFC822-Address.html
  2. From Stackoverflow: http://stackoverflow.com/questions/46155/validate-email-address-in-javascript
  3. Another thread from Stackoverflow(better): http://stackoverflow.com/questions/201323/using-a-regular-expression-to-validate-an-email-address
  4. RFC-compliant email address validation: http://isemail.info/_system/is_email/test/?all
  5. RegularExpression.info, How to Find or Validate an Email Address: http://www.regular-expressions.info/email.html
*/

var emailRegex = /^([_a-z0-9-]+)(\.[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,4})$/i;

emailRegex.test("Allen@dxhackers.org"); //=> true
emailRegex.test("allen.xx@dx.org");     //=> true
emailRegex.test("a.b.c@d.com");         //=> true
emailRegex.test("allen@dx");            //=> false

{2,4} ? People at info@dot.swiss are unhappy, but hey, that's a new domain at least. info@about.museum has been active for 15 years now, enough with the 4-character TLD folklore.