update elements and fix some bugs

lib/src/prism/components/prism-handlebars.js

 (function(Prism) {
 
         var handlebars_pattern = /\{\{\{[\w\W]+?\}\}\}|\{\{[\w\W]+?\}\}/g;
 
         Prism.languages.handlebars = Prism.languages.extend('markup', {
                 'handlebars': {
                         pattern: handlebars_pattern,
                         inside: {
                                 'delimiter': {
                                         pattern: /^\{\{\{?|\}\}\}?$/i,
                                         alias: 'punctuation'
                                 },
-                                'string': /(["'])(\\?.)+?\1/,
-                                'number': /\b-?(0x[\dA-Fa-f]+|\d*\.?\d+([Ee]-?\d+)?)\b/,
+                                'string': /(["'])(\\?.)*?\1/,
+                                'number': /\b-?(0x[\dA-Fa-f]+|\d*\.?\d+([Ee][+-]?\d+)?)\b/,
                                 'boolean': /\b(true|false)\b/,
                                 'block': {
-                                        pattern: /^(\s*~?\s*)[#\/]\S+/i,
+                                        pattern: /^(\s*~?\s*)[#\/]\S+?(?=\s*~?\s*$|\s)/i,
                                         lookbehind: true,
                                         alias: 'keyword'
                                 },
                                 'brackets': {
                                         pattern: /\[[^\]]+\]/,
                                         inside: {
                                                 punctuation: /\[|\]/,
                                                 variable: /[\w\W]+/
                                         }
                                 },
                                 'punctuation': /[!"#%&'()*+,.\/;<=>@\[\\\]^`{|}~]/,
-                                'variable': /[^!"#%&'()*+,.\/;<=>@\[\\\]^`{|}~]+/
+                                'variable': /[^!"#%&'()*+,.\/;<=>@\[\\\]^`{|}~\s]+/
                         }
                 }
         });
 
         // Comments are inserted at top so that they can
         // surround markup
         Prism.languages.insertBefore('handlebars', 'tag', {
                 'handlebars-comment': {
                         pattern: /\{\{![\w\W]*?\}\}/,
                         alias: ['handlebars','comment']
@@ skipping 26 matching lines @@
         });
 
         // Re-insert the tokens after highlighting
         // and highlight them with defined grammar
         Prism.hooks.add('after-highlight', function(env) {
                 if (env.language !== 'handlebars') {
                         return;
                 }
 
                 for (var i = 0, t; t = env.tokenStack[i]; i++) {
-                        env.highlightedCode = env.highlightedCode.replace('___HANDLEBARS' + (i + 1) + '___', Prism.highlight(t, env.grammar, 'handlebars'));
+                        // The replace prevents $$, $&, $`, $', $n, $nn from being interpreted as special patterns
+                        env.highlightedCode = env.highlightedCode.replace('___HANDLEBARS' + (i + 1) + '___', Prism.highlight(t, env.grammar, 'handlebars').replace(/\$/g, '$$$$'));
                 }
 
                 env.element.innerHTML = env.highlightedCode;
         });
 
 }(Prism));