Webflags: g

HTML Comment

Match HTML comments, including multi-line comments and empty ones.

Try it in RegexPro →

Available in

JSSupported

JavaScript / ECMAScript

Browser-native RegExp. Default if you don't pick.

PYSupported

Python (re)

CPython stdlib `re`. Unicode-aware `\w` and `\d` by default.

GOSupported

Go (RE2)

Linear-time matching. No backreferences or lookarounds.

Pattern

regexengine-agnostic
<!--[\s\S]*?-->   (flags: g)

Raw source: <!--[\s\S]*?-->

How it works

Opens with <!--, then lazily matches any characters (including newlines via [\s\S]) until the first -->. Lazy quantifier prevents greedy spanning across multiple comments.

Examples

Input

<!-- hello -->

Matches

  • <!-- hello -->

Input

<p>keep</p><!-- remove --><span>keep</span>

Matches

  • <!-- remove -->

Input

no comments here

No match

—

Common use cases

  • •Stripping comments from HTML output
  • •Build-time template cleanup
  • •Detecting conditional IE comments
  • •Static site generator preprocessing

Related patterns

HTML Attribute

Web

Match HTML attributes of the form name="value" or name='value' and capture both parts.

HTML Entity

Web

Match HTML entities in named (`&amp;`), numeric (`&#123;`), or hex (`&#x1F4A9;`) form.

HTML Tag Matcher

Web

Match paired HTML tags and capture the tag name and inner content using a back-reference.

CSS Class from `class=""` Attribute

Web

Extract the value of a `class="..."` attribute from raw HTML, handling double or single quotes.

Related concepts

Lazy vs. Greedy Quantifiers

Concept

Greedy quantifiers (*, +) consume as much as possible before backtracking. Lazy quantifiers (*?, +?) consume as little as possible.

Regex Flags in JavaScript: g, i, m, s, u, y

Concept

Flags modify regex behavior globally. g enables global matching, i makes it case-insensitive, m changes anchor behavior, s dots match newlines, u enables Unicode, y is sticky.

How to Match Across Newlines in JavaScript

How-to

The dot doesn't match newlines by default. Use the s (dotall) flag, or build an explicit [\s\S] alternative for engines that predate s.

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