# Regular Expression Syntax (Edition In Progress)
**URL:** https://community.mp3tag.de/t/regular-expression-syntax-edition-in-progress/42020
**Category:** General Discussion
**Created:** [June 24, 2018, 1:01pm UTC](https://community.mp3tag.de/t/regular-expression-syntax-edition-in-progress/42020 "2018-06-24T13:01:39Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Alex5](https://community.mp3tag.de/u/Alex5)
#### Post date: [June 24, 2018, 1:01pm UTC](https://community.mp3tag.de/t/regular-expression-syntax-edition-in-progress/42020/1 "2018-06-24T13:01:39Z")
I made a simplifyed version of RES, making everything clearer to operate with single-line moderations only though. Anyway check it out and vote for it, so everyone does not have to ask questions "how-to-do-this-help", and can write his needed code himself(/herself)
All **characters** are **literals** except **[.] [|] [\*] [?] [+] [(] [)] [{] [}] [[] [] ] [^] [$]**.
These characters are literals when preceded by a **[\]**.
**[MATCHING]** - use **[x]** to match:
**[^]** - [starting from the start of a line]
**[$]** - [starting from the end of a line]
**[[abc] ]** - [every character of **[a]**, **[b]**, and **[c]** (bigger or smaller combinations also possible)]
**[[^abc] ]** - [any character other than **[a]**, **[b]**, or **[c]** (bigger or smaller combinations also possible)]
**[[a-z] ]** - [any character in the range **[a]** to **[z]**]
**[[^A-Z] ]** - [any character other than in the range **[a]** to **[z]**]
**[.]** - [any single character]
**[\w]** - [any word character from all alphanumeric characters plus the underscore]
**[\s]** - [any whitespace character]
**[\d]** - [any digit]
**[\l]** - [any lower case character]
**[\u]** - [Any upper case character]
**[\W]** - [non-word character]
**[\S]** - [non-whitespace character]
**[\D]** - [non-digit]
**[\L]** - [non-lower case character]
**[\U]** - [non-upper case character]
**[\b]** - [a word boundary (the start or end of a word)]
**[\B]** - [any line location only when not at a word boundary]
**[REPEATS]** - after matching a literal, add **[x]**, when it's repeated:
**[\*]** - [any number of times including zero]
**[+]** - [any number of times, but at least once]
**[?]** - [zero or one times only]
**[{n}]** - [exactly n times]
**[{n,}]** - [at least **n** times with no upper limit]
**[{n,m}]** - [between **n** and **m** times]
You are free to copy paste it, remaster or anything else. We all just have to come up with a good RES Guide.
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### Author:  [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [June 24, 2018, 1:27pm UTC](https://community.mp3tag.de/t/regular-expression-syntax-edition-in-progress/42020/2 "2018-06-24T13:27:09Z")
Maybe this should be moved to:
> [@Regular Expressions](https://community.mp3tag.de/t/regular-expressions/521):
>
> This topic collects some useful regular expressions. If you created a regular expression which solves a common task, please post it here and give a short description what it is supposed to do. These regular expressions can be used with the action type Replace with regular expression. Please look at [FAQ: How do I create a new action?](https://community.mp3tag.de/t/967/1) to learn more about actions in Mp3tag. Important: The regular expressions are user-contributed solutions of individual tasks. Test with a copy of your files first…
and / or combined with
> **[Replace with Regular Expression – Mp3tag Documentation](https://docs.mp3tag.de/actions/replace-regexp/)**
>
> Documentation on the Replace with Regular Expression action type that can be performed as Quick Action or as reusable workflow from Action Groups. Mp3tag is the universal Tag Editor.
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### Author:  [@LaurenBacall](https://community.mp3tag.de/u/LaurenBacall)
#### Post date: [June 24, 2018, 1:52pm UTC](https://community.mp3tag.de/t/regular-expression-syntax-edition-in-progress/42020/3 "2018-06-24T13:52:10Z")
> [@Alex5](#):
>
> All **characters** are **literals** except **[.] [|] [\*] [?] [+] [(] [)] [{] [}] [[] [] ] [^] [$]**.
> These characters are literals when preceded by a **[\]**.
For legibility sake such characters/examples might be better being formatted as inline code tags by wrapping each with single backticks (a feature of Markdown).
Eg: `.` `|` `*` `?` `+` `(` `)` `{` `}` `[` `]` `^` `$`
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### Author:  [@Alex5](https://community.mp3tag.de/u/Alex5)
#### Post date: [June 24, 2018, 2:10pm UTC](https://community.mp3tag.de/t/regular-expression-syntax-edition-in-progress/42020/4 "2018-06-24T14:10:35Z")
good idea thx (20 characters needed wtf)