diff --git a/app/utils.js b/app/utils.js
index 1bccfad..8ea256b 100644
--- a/app/utils.js
+++ b/app/utils.js
@@ -1,207 +1,207 @@
 import uuidv4 from 'uuid/v4';
 import SillyNames from './SillyNames';
 import MaterialColors from './MaterialColors';
 import { Clipboard, Dimensions } from 'react-native';
 import Contacts from 'react-native-contacts';
 
 const RNFS = require('react-native-fs');
 const logfile = RNFS.DocumentDirectoryPath + '/logs.txt';
 
 function log2file(text) {
     // append to logfile
     RNFS.appendFile(logfile, text + '\r\n', 'utf8')
       .then((success) => {
         console.log(text);
       })
       .catch((err) => {
         console.log(err.message);
       });
 }
 
 function isAnonymous(uri) {
     if (uri.indexOf('@guest.') > -1 || uri.indexOf('@anonymous.') > -1) {
         return true
     }
 
     if (uri.indexOf('@192.168.') > -1) {
         return true;
     }
 
     if (uri.indexOf('@10.') > -1) {
         return true;
     }
 
     return false;
 }
 
 
 function appendLeadingZeroes(n){
     if (n <= 9) {
         return "0" + n;
      }
     return n;
 }
 
 function timestampedLog() {
     let current_datetime = new Date();
     let formatted_date = current_datetime.getFullYear() + "-" + appendLeadingZeroes(current_datetime.getMonth() + 1) + "-" + appendLeadingZeroes(current_datetime.getDate()) + " " + appendLeadingZeroes(current_datetime.getHours()) + ":" + appendLeadingZeroes(current_datetime.getMinutes()) + ":" + appendLeadingZeroes(current_datetime.getSeconds());
     let message = formatted_date;
 
     for (var i = 0; i < arguments.length; i++) {
         let txt = arguments[i] ? arguments[i].toString() : '';
         message = message + ' ' + txt;
     }
 
     log2file(message);
     //console.log(message);
 }
 
 
 function generateUniqueId() {
     const uniqueId = uuidv4().replace(/-/g, '').slice(0, 16);
     return uniqueId;
 }
 
 function normalizeUri(uri, defaultDomain) {
     let targetUri = uri;
     let idx = targetUri.indexOf('@');
     let username;
     let domain;
     if (idx !== -1) {
         username = targetUri.substring(0, idx);
         domain = targetUri.substring(idx + 1);
     } else {
         username = targetUri;
         domain = defaultDomain;
     }
-    username = username.replace(/[\s()-]/g, '');
+    username = username.replace(/[<>\s()\[\]\'\"\~\!\%\&\*\{\}\|\\]/g, '');
     return `${username}@${domain}`;
 }
 
 function copyToClipboard(text) {
     Clipboard.setString(text);
 
     return true;
 }
 
 function findContact(uri) {
     return new Promise((resolve, reject) => {
         //console.log('findContact')
         Contacts.checkPermission((err, permission) => {
             if (err) {
                 //log the error
                 console.log(err);
                 return reject(err);
             }
 
             if (permission === 'authorized') {
                 //console.log('HELLO', uri);
                 Contacts.getContactsByEmailAddress(uri, (err, contacts) => {
                     if (err) {
                         console.log('error getting contacts by email')
                         return reject(err);
                     }
 
                     if (contacts) {
                         return resolve(contacts)
                     }
 
                     Contacts.getContactsMatchingString(uri, (err2, contacts2) => {
                         if (err2) {
                             console.log('error matching string')
                             return reject(err2);
                         }
                         console.log(contacts);
                         resolve(contacts2)
                     });
 
                 })
 
             } else {
                 console.log('not authortised')
                 reject(new Error('Not Authorised'))
             }
         })
     })
 }
 
 function generateSillyName() {
     const adjective = SillyNames.randomAdjective();
     const number = Math.floor(Math.random() * 10);
     const noun1 =  SillyNames.randomNoun();
     const noun2 = SillyNames.randomNoun();
     return adjective + noun1 + noun2 + number;
 }
 
 function generateMaterialColor(text) {
     return MaterialColors.generateColor(text);
 }
 
 function generateVideoTrack(stream, width = 640, height = 480) {
     // const audioCtx = new (window.AudioContext || window.webkitAudioContext)();
     // const analyser = audioCtx.createAnalyser();
     // const source = audioCtx.createMediaStreamSource(stream);
     // source.connect(analyser);
 
     // analyser.fftSize = 256;
     // const bufferLength = analyser.frequencyBinCount;
     // const dataArray = new Uint8Array(bufferLength);
 
     // const canvas = Object.assign(document.createElement('canvas'), {width, height});
     // const ctx = canvas.getContext('2d');
 
     // const img = new Image();
     // const blinkLogo = new Image();
     // img.addEventListener('load', () => {
     //     draw();
     // });
 
     // const draw = () => {
     //     if (stream.active) {
     //         const drawVisual = requestAnimationFrame(draw);
     //     }
     //     analyser.getByteFrequencyData(dataArray);
 
     //     ctx.fillStyle = 'rgb(35, 35, 35)';
     //     ctx.fillRect(0, 0, width, height);
     //     ctx.filter = 'grayscale(100%) brightness(90%)';
     //     ctx.drawImage(blinkLogo, (width / 2) - 150, (height / 2) - 150, 300, 300);
     //     ctx.filter = 'none';
     //     ctx.drawImage(img, (width / 2) - 45 , height / 3, 90, 90);
     //     const barWidth = (width / bufferLength) * 2.5;
     //     let barHeight;
     //     let x = 0;
     //     for(var i = 0; i < bufferLength; i++) {
     //         barHeight = dataArray[i] / 2;
 
     //         ctx.fillStyle = 'rgb(' + (barHeight + 100) + ', 50, 50)';
     //         ctx.fillRect(x, 2 * height / 3 - barHeight / 2, barWidth, barHeight);
 
     //         x += barWidth + 1;
     //     }
     // };
     // img.src = 'assets/images/video-camera-slash.png';
     // blinkLogo.src = 'assets/images/blink-white-big.png';
 
     // const canvasStream = canvas.captureStream();
 
 
     return Object.assign(stream.getVideoTracks()[0], {enabled: true});
 }
 
 function getWindowHeight() {
     return Dimensions.get('window').height;
 }
 
 exports.copyToClipboard = copyToClipboard;
 exports.normalizeUri = normalizeUri;
 exports.generateSillyName = generateSillyName;
 exports.timestampedLog = timestampedLog;
 exports.appendLeadingZeroes = appendLeadingZeroes;
 exports.generateUniqueId = generateUniqueId;
 exports.generateMaterialColor = generateMaterialColor;
 exports.generateVideoTrack = generateVideoTrack;
 exports.getWindowHeight = getWindowHeight;
 exports.findContact = findContact;
 exports.findContact = findContact;
 exports.isAnonymous = isAnonymous;