# Full documentation for regex syntax?

**URL:** https://community.mp3tag.de/t/full-documentation-for-regex-syntax/15421
**Category:** Support
**Created:** [January 21, 2014, 3:39pm UTC](https://community.mp3tag.de/t/full-documentation-for-regex-syntax/15421 "2014-01-21T15:39:51Z")
**Posts on this page:** 5
**Page:** 1

<div class="post-metadata">

### Author: ![chrisjj](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/c/a698b9/32.png) [@chrisjj](https://community.mp3tag.de/u/chrisjj)
#### Post date: [January 21, 2014, 3:39pm UTC](https://community.mp3tag.de/t/full-documentation-for-regex-syntax/15421/1 "2014-01-21T15:39:51Z")

</div>

Can anyone direct me to the full documentation for the regex syntax? e.g. as provided by the engine Mp3tag uses.

I've seen [https://docs.mp3tag.de/actions/replace-regexp](https://docs.mp3tag.de/actions/replace-regexp) but it omits e.g. mode modifiers, such as:

[Filter expressions](https://community.mp3tag.de/t/10080/4)

> [@](#):
>
> Case sensitive filter:  
> title MATCHES (?-i)regex

Thanks.

---

<div class="post-metadata">

### Author: ![DetlevD](https://community.mp3tag.de/user_avatar/community.mp3tag.de/detlevd/32/123_2.png) [@DetlevD](https://community.mp3tag.de/u/DetlevD)
#### Post date: [January 21, 2014, 3:52pm UTC](https://community.mp3tag.de/t/full-documentation-for-regex-syntax/15421/2 "2014-01-21T15:52:33Z")

</div>

> [@chrisjj](#):
>
> Can anyone direct me to the full documentation for the regex syntax? e.g. as provided by the engine Mp3tag uses. ...

Search the internet for **"Boost.Regex"**.

DD.20140121.1752.CET

---

<div class="post-metadata">

### Author: ![chrisjj](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/c/a698b9/32.png) [@chrisjj](https://community.mp3tag.de/u/chrisjj)
#### Post date: [March 24, 2014, 11:45am UTC](https://community.mp3tag.de/t/full-documentation-for-regex-syntax/15421/3 "2014-03-24T11:45:35Z")

</div>

Thanks D. Has there been an official statement that Mp3tag regex syntax is the same as Boost.Regex's?

---

<div class="post-metadata">

### Author: ![chrisjj](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/c/a698b9/32.png) [@chrisjj](https://community.mp3tag.de/u/chrisjj)
#### Post date: [August 13, 2014, 8:10pm UTC](https://community.mp3tag.de/t/full-documentation-for-regex-syntax/15421/4 "2014-08-13T20:10:49Z")

</div>

FTR, this error

 ![](http://i.imgur.com/89EA0D8.png)

suggests the syntax is Perl.

So if the engine is Boost, the regexp syntax documentation is [this](http://www.boost.org/doc/libs/1_55_0/libs/regex/doc/html/boost_regex/syntax/perl_syntax.html).

---

<div class="post-metadata">

### Author: ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:24pm UTC](https://community.mp3tag.de/t/full-documentation-for-regex-syntax/15421/5 "2026-02-09T12:24:52Z")

</div>