What is the regex for html comment?

The regex pattern for html comment is ` `. This pattern validates html comment block (multi-line safe).

How do I use this regex in JavaScript?

In JavaScript, create the regex with `const regex = / /;` and test with `regex.test(yourValue)`. It returns `true` if the value matches.

How do I use this regex in Python?

In Python, use `import re; re.match(r' ', value)`. The raw string prefix (`r`) prevents Python from interpreting backslashes as escape characters.

Is this regex case-sensitive?

By default, yes. To make it case-insensitive, add the `i` flag in JavaScript (`/ /i`) or use `re.IGNORECASE` in Python.

Regex for HTML Comment

Regex Pattern

HTML comment block (multi-line safe)

Quick Answer

The regex pattern for html comment is ``. HTML comment block (multi-line safe). This works in JavaScript, Python, Ruby, PHP, Java, and most regex engines that support PCRE syntax.

Test Examples

Input	Result
<!-- this is a comment -->	✓ Matches
<!-- multi\nline -->	✓ Matches
<!-- unclosed	✗ No match
not a comment	✗ No match

Code Examples

javascript

const regex = /<!--[\s\S]*?-->/;
const isValid = regex.test(value);

python

import re
pattern = r'<!--[\s\S]*?-->'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /<!--[\s\S]*?-->/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/<!--[\s\S]*?-->/', $value)) {
    echo "valid";
}

java

String pattern = "<!--[\\s\\S]*?-->";
boolean isValid = value.matches(pattern);

Frequently Asked Questions

Related Regex Patterns

HTML Tag

Any HTML tag (opening, closing, or self-closing)

HTML Attribute

HTML attribute key-value pair (attr="value")

HTML Self-Closing Tag

Self-closing HTML tags like <br/>, <img/>, <input/>

HTML Entity

HTML character entity (named or numeric)

Semantic HTML5 Tag

HTML5 semantic element tags

XML Namespace

XML namespace declaration (xmlns or xmlns:prefix)