How to use the COMMENT function from highlight.js

highlight.js.COMMENT is a regular expression in the highlight.js library that matches comments in source code.

How does highlight.js.COMMENT work?

In the highlight.js library, highlight.js.COMMENT is a regular expression that matches comments in source code. The regular expression is designed to match various types of comments that can appear in different programming languages, including single-line comments, multi-line comments, and inline comments. The regular expression is typically used in conjunction with the hljs.registerLanguage function to define new syntax highlighting rules for a specific programming language. For example, here's how you might define syntax highlighting rules for JavaScript using highlight.js.COMMENT: javascript Copy code {{{{{{{ const hljs = require('highlight.js/lib/core'); const javascript = require('highlight.js/lib/languages/javascript'); hljs.registerLanguage('javascript', javascript); // ... const code = `// This is a single-line comment /* This is a multi-line comment */`; const highlightedCode = hljs.highlight('javascript', code).value; console.log(highlightedCode); In this example, we're first importing the highlight.js library and the javascript language definition from the highlight.js/lib folder. We're then registering the javascript language definition using hljs.registerLanguage, which tells highlight.js how to tokenize and highlight JavaScript code. We then define a string code that contains some JavaScript code with both single-line and multi-line comments. We use the hljs.highlight function to tokenize and highlight the code using the javascript language definition, and assign the result to highlightedCode. Finally, we log highlightedCode to the console, which will contain the original code with syntax highlighting applied. Overall, highlight.js.COMMENT is a regular expression that provides a flexible and customizable way to match comments in source code, allowing highlight.js to apply syntax highlighting to code across multiple programming languages.

Ai Example

1
2
3
4
5
6
7
8
9
10
const hljs = require("highlight.js/lib/core");

const code = `// This is a single-line comment
/* This is a multi-line
comment */`;

const commentRegex = hljs.COMMENT;
const matches = code.match(commentRegex);

console.log(matches);

In this example, we're first importing the highlight.js library and creating a string code that contains some JavaScript code with both single-line and multi-line comments. We then define a variable commentRegex that contains the hljs.COMMENT regular expression. We use the match method on the code string to find all matches of this regular expression within the string, and assign the result to matches. Finally, we log matches to the console, which will contain an array of all comment matches found in the code string, including both single-line and multi-line comments. Each match in the array will be a string containing the matched comment text. Overall, highlight.js.COMMENT provides a powerful regular expression that can be used to match comments in source code across multiple programming languages, making it easier to apply syntax highlighting to code snippets.