prismjs/components/prism-aspnet.js

Prism.languages.aspnet = Prism.languages.extend('markup', {
	'page-directive': {
		pattern: /<%\s*@.*%>/i,
		alias: 'tag',
		inside: {
			'page-directive': {
				pattern: /<%\s*@\s*(?:Assembly|Control|Implements|Import|Master(?:Type)?|OutputCache|Page|PreviousPageType|Reference|Register)?|%>/i,
				alias: 'tag'
			},
			rest: Prism.languages.markup.tag.inside
		}
	},
	'directive': {
		pattern: /<%.*%>/i,
		alias: 'tag',
		inside: {
			'directive': {
				pattern: /<%\s*?[$=%#:]{0,2}|%>/i,
				alias: 'tag'
			},
			rest: Prism.languages.csharp
		}
	}
});
// Regexp copied from prism-markup, with a negative look-ahead added
Prism.languages.aspnet.tag.pattern = /<(?!%)\/?[^\s>\/]+(?:\s+[^\s>\/=]+(?:=(?:("|')(?:\\[\s\S]|(?!\1)[^\\])*\1|[^\s'">=]+))?)*\s*\/?>/i;

// match directives of attribute value foo="<% Bar %>"
Prism.languages.insertBefore('inside', 'punctuation', {
	'directive': Prism.languages.aspnet['directive']
}, Prism.languages.aspnet.tag.inside["attr-value"]);

Prism.languages.insertBefore('aspnet', 'comment', {
	'asp-comment': {
		pattern: /<%--[\s\S]*?--%>/,
		alias: ['asp', 'comment']
	}
});

// script runat="server" contains csharp, not javascript
Prism.languages.insertBefore('aspnet', Prism.languages.javascript ? 'script' : 'tag', {
	'asp-script': {
		pattern: /(<script(?=.*runat=['"]?server['"]?)[\s\S]*?>)[\s\S]*?(?=<\/script>)/i,
		lookbehind: true,
		alias: ['asp', 'script'],
		inside: Prism.languages.csharp || {}
	}
});