Regex expression.js

Prism.languages.javascript = Prism.languages.extend('clike', {
	'class-name': [
		Prism.languages.clike['class-name'],
		{
			pattern: /(^|[^$\w\xA0-\uFFFF])[_$A-Z\xA0-\uFFFF][$\w\xA0-\uFFFF]*(?=\.(?:prototype|constructor))/,
			lookbehind: true
		}
	],
	'keyword': [
		{
			pattern: /((?:^|})\s*)(?:catch|finally)\b/,
			lookbehind: true
		},
		{
			pattern: /(^|[^.]|\.\.\.\s*)\b(?:as|async(?=\s*(?:function\b|\(|[$\w\xA0-\uFFFF]|$))|await|break|case|class|const|continue|debugger|default|delete|do|else|enum|export|extends|for|from|function|(?:get|set)(?=\s*[\[$\w\xA0-\uFFFF])|if|implements|import|in|instanceof|interface|let|new|null|of|package|private|protected|public|return|static|super|switch|this|throw|try|typeof|undefined|var|void|while|with|yield)\b/,
			lookbehind: true
		},
	],
	'number': /\b(?:(?:0[xX](?:[\dA-Fa-f](?:_[\dA-Fa-f])?)+|0[bB](?:[01](?:_[01])?)+|0[oO](?:[0-7](?:_[0-7])?)+)n?|(?:\d(?:_\d)?)+n|NaN|Infinity)\b|(?:\b(?:\d(?:_\d)?)+\.?(?:\d(?:_\d)?)*|\B\.(?:\d(?:_\d)?)+)(?:[Ee][+-]?(?:\d(?:_\d)?)+)?/,
	// Allow for all non-ASCII characters (See http://stackoverflow.com/a/2008444)
	'function': /#?[_$a-zA-Z\xA0-\uFFFF][$\w\xA0-\uFFFF]*(?=\s*(?:\.\s*(?:apply|bind|call)\s*)?\()/,
	'operator': /--|\+\+|\*\*=?|=>|&&=?|\|\|=?|[!=]==|<<=?|>>>?=?|[-+*/%&|^!=<>]=?|\.{3}|\?\?=?|\?\.?|[~:]/
});

Prism.languages.javascript['class-name'][0].pattern = /(\b(?:class|interface|extends|implements|instanceof|new)\s+)[\w.\\]+/;

Prism.languages.insertBefore('javascript', 'keyword', {
	'regex': {
		pattern: /((?:^|[^$\w\xA0-\uFFFF."'\])\s]|\b(?:return|yield))\s*)\/(?:\[(?:[^\]\\\r\n]|\\.)*]|\\.|[^/\\\[\r\n])+\/[gimyus]{0,6}(?=(?:\s|\/\*(?:[^*]|\*(?!\/))*\*\/)*(?:$|[\r\n,.;:})\]]|\/\/))/,
		lookbehind: true,
		greedy: true
	},
	// This must be declared before keyword because we use "function" inside the look-forward
	'function-variable': {
		pattern: /#?[_$a-zA-Z\xA0-\uFFFF][$\w\xA0-\uFFFF]*(?=\s*[=:]\s*(?:async\s*)?(?:\bfunction\b|(?:\((?:[^()]|\([^()]*\))*\)|[_$a-zA-Z\xA0-\uFFFF][$\w\xA0-\uFFFF]*)\s*=>))/,
		alias: 'function'
	},
	'parameter': [
		{
			pattern: /(function(?:\s+[_$A-Za-z\xA0-\uFFFF][$\w\xA0-\uFFFF]*)?\s*\(\s*)(?!\s)(?:[^()]|\([^()]*\))+?(?=\s*\))/,
			lookbehind: true,
			inside: Prism.languages.javascript
		},
		{
			pattern: /[_$a-z\xA0-\uFFFF][$\w\xA0-\uFFFF]*(?=\s*=>)/i,
			inside: Prism.languages.javascript
		},
		{
			pattern: /(\(\s*)(?!\s)(?:[^()]|\([^()]*\))+?(?=\s*\)\s*=>)/,
			lookbehind: true,
			inside: Prism.languages.javascript
		},
		{
			pattern: /((?:\b|\s|^)(?!(?:as|async|await|break|case|catch|class|const|continue|debugger|default|delete|do|else|enum|export|extends|finally|for|from|function|get|if|implements|import|in|instanceof|interface|let|new|null|of|package|private|protected|public|return|set|static|super|switch|this|throw|try|typeof|undefined|var|void|while|with|yield)(?![$\w\xA0-\uFFFF]))(?:[_$A-Za-z\xA0-\uFFFF][$\w\xA0-\uFFFF]*\s*)\(\s*|\]\s*\(\s*)(?!\s)(?:[^()]|\([^()]*\))+?(?=\s*\)\s*\{)/,
			lookbehind: true,
			inside: Prism.languages.javascript
		}
	],
	'constant': /\b[A-Z](?:[A-Z_]|\dx?)*\b/
});

Prism.languages.insertBefore('javascript', 'string', {
	'template-string': {
		pattern: /`(?:\\[\s\S]|\${(?:[^{}]|{(?:[^{}]|{[^}]*})*})+}|(?!\${)[^\\`])*`/,
		greedy: true,
		inside: {
			'template-punctuation': {
				pattern: /^`|`$/,
				alias: 'string'
			},
			'interpolation': {
				pattern: /((?:^|[^\\])(?:\\{2})*)\${(?:[^{}]|{(?:[^{}]|{[^}]*})*})+}/,
				lookbehind: true,
				inside: {
					'interpolation-punctuation': {
						pattern: /^\${|}$/,
						alias: 'punctuation'
					},
					rest: Prism.languages.javascript
				}
			},
			'string': /[\s\S]+/
		}
	}
});

if (Prism.languages.markup) {
	Prism.languages.markup.tag.addInlined('script', 'javascript');
}

Prism.languages.js = Prism.languages.javascript;