regex-empty-conditional-comments
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Regular expression for matching HTML empty conditional comments
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<h1 align="center">regex-empty-conditional-comments</h1>
<p align="center">Regular expression for matching HTML empty conditional comments</p>
<p align="center">
<a href="https://codsen.com/os/regex-empty-conditional-comments" rel="nofollow noreferrer noopener">
<img src="https://img.shields.io/badge/-codsen-blue?style=flat-square" alt="page on codsen.com">
</a>
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</a>
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</p>
## Install
This package is [pure ESM](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c). If you're not ready yet, install an older version of this program, 1.11.0 (`npm i regex-empty-conditional-comments@1.11.0`).
```bash
npm i regex-empty-conditional-comments
```
## Quick Take
```js
import { strict as assert } from "assert";
import { emptyCondCommentRegex } from "regex-empty-conditional-comments";
// empty comment which was meant to target Outlook-only
assert.equal(
emptyCondCommentRegex().test(`<!--[if !mso]>
<![endif]-->`),
true,
);
// empty comment which was meant to target non-Outlook-only
assert.equal(
emptyCondCommentRegex().test(`<!--[if !mso]><!-- -->
<!--<![endif]-->`),
true,
);
assert.equal(
emptyCondCommentRegex().test(`<!--[if !mso]><!-- -->
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<!--<![endif]-->`),
false,
);
assert.equal(
emptyCondCommentRegex().test(`<!--[if gte mso 9]><xml>
<o:OfficeDocumentSettings>
<o:AllowPNG/>
<o:PixelsPerInch>96</o:PixelsPerInch>
</o:OfficeDocumentSettings>
</xml><![endif]-->`),
false,
);
assert.equal(
emptyCondCommentRegex().exec("<html><!--[if !mso]><![endif]--><title>")[0],
"<!--[if !mso]><![endif]-->",
);
assert.deepEqual(
`<html> <!--[if !mso]><![endif]--> <title>text</title> <!--[if gte mso 9]>
<xml>
<![endif]-->`.match(emptyCondCommentRegex()),
["<!--[if !mso]><![endif]-->"],
);
```
## Documentation
Please [visit codsen.com](https://codsen.com/os/regex-empty-conditional-comments/) for a full description of the API.
## Contributing
To report bugs or request features or assistance, [raise an issue](https://github.com/codsen/codsen/issues/new/choose) on GitHub.
## Licence
MIT License.
Copyright © 2010-2025 Roy Revelt and other contributors.
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