JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app="watchApp">
    <div ng-controller="watchController">
        <input type="text" ng-model="name" ng-trim='false'/>
    </div>
</div>

JavaScript

var app = angular.module('watchApp',[]);
app.controller("watchController",['$scope','$timeout',function($scope, $timeout){
    $scope.name = "";
    $scope.$watch("name",function(){
        $scope.name = $scope.name.toLowerCase().replace(/\s+/g,'');         
    });
}]);