Email validation

README.md

140byt.es

A tweet-sized, fork-to-play, community-curated collection of JavaScript.

How to play

1. Click the button above to fork this gist.
2. Modify all the files to according to the rules below.
3. Save your entry and tweet it up!

Rules

All entries must exist in an index.js file, whose contents are

1. a valid Javascript function expression, that
2. optionally self-executes,
3. contains no more than 140 bytes, and
4. does not pollute global scope.

All entries must also be licensed under the MIT license.

For more information

The 140byt.es site hasn't launched yet, but for now follow @140bytes on Twitter.

140byt.es is brought to you by Jed Schmidt. It was inspired by work from Thomas Fuchs and Dustin Diaz.

annotated.js

function(){
  /* Rules:                      
  (1) anonymous function     // make sure
  (2) may be self-executing  // to annotate
  (3) <=140 bytes            // your code
  (4) no globals             // so everyone
  (5) MIT license            // can learn
  (6) have a good time!      // from it!
*/}

index.js

function(){/*Rules: (1) anonymous function (2) may be self-executing (3) <=140 bytes (4) no globals (5) MIT license (6) have a good time!*/}

LICENSE.txt

Copyright (c) 2011 YOUR_NAME_HERE, YOUR_URL_HERE
 
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
 
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package.json

{
  // [REQUIRED] A name for your library.
  // This must match /^[a-z_]\w*$/i
  "name": "140bytes",

  // [OPTIONAL] A description of your library, phrased as a verb predicate.
  // The gist description is used by default.
  "description": "Explain the 140byt.es rules.",

  // [OPTIONAL] Up to 5 keywords used for indexing.
  "keywords": [
    "140bytes",
    "master",
    "rules" 
  ]
}

I found this by surfing the examples at 140byt.es. It's possible to shorten your regular expression without changing anything. Simply omit most of the backslashes (not needed inside character classes) and unused brackets.

function(a){return/^[\w.%+-]+@([A-Z\d-]+\.)+[A-Z]{2,6}$/i.test(a)}

Please note that this validation (similar to almost all email validations you can find on the web) reject many valid email addresses. For example, it rejects international domain names like tüv.de. I suggest reading this very good article from the Linux Journal: Validate an E-Mail Address with PHP, the Right Way.