Support for 3-letter hashtags

app/js/services.js

@@ -3077,7 +3077,7 @@ angular.module('myApp.services', [])
                         "\\uffa1-\\uffdc";                  // half width Hangul (Korean)
 var regexAlphaNumericChars  = "0-9\.\_" + regexAlphaChars;
 
-  var regExp = new RegExp('((?:(ftp|https?)://|(?:mailto:)?([A-Za-z0-9._%+-]+@))(\\S*\\.\\S*[^\\s.;,(){}<>"\']))|(\\n)|(' + emojiUtf.join('|') + ')|(^|\\s)(#[' + regexAlphaNumericChars + ']{4,20})', 'i');
+  var regExp = new RegExp('((?:(ftp|https?)://|(?:mailto:)?([A-Za-z0-9._%+-]+@))(\\S*\\.\\S*[^\\s.;,(){}<>"\']))|(\\n)|(' + emojiUtf.join('|') + ')|(^|\\s)(#[' + regexAlphaNumericChars + ']{3,20})', 'i');
   var youtubeRegex = /(?:https?:\/\/)?(?:www\.)?youtu(?:|.be|be.com|.b)(?:\/v\/|\/watch\\?v=|e\/|\/watch(?:.+)v=)(.{11})(?:\&[^\s]*)?/;
 
   return {