# Prefix title with Composer LastName **URL:** \ **Category:** Support\ **Created:** [December 8, 2020, 8:12am UTC](https://community.mp3tag.de/t/prefix-title-with-composer-lastname/51069 "2020-12-08T08:12:29Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Noteworthy](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/n/bc79bd/32.png) [@Noteworthy](https://community.mp3tag.de/u/Noteworthy)\ **Post date:** [December 8, 2020, 8:12am UTC](https://community.mp3tag.de/t/prefix-title-with-composer-lastname/51069/1 "2020-12-08T08:12:29Z")
Hello, As the subject line says, I wish to prefix the title of a track with the last name of the composer, eg: Composer tag contains: "Bach, Johann Sebastian" Title: Sonata No. 1 in E-flat major BWV 525 Title should read: Bach: Sonata No. 1 in E-flat major BWV 525 Note: ALL Composer tags of my classical music tracks are populated with this configuration without exception: LastName, First and other names. Hyphenated names: Rimsky-Korsakov, Nikolai. The single comma in the name is key to identifying the Lastname the precedes it. I am trying to learn the subtleties of regular expression, but if anyone can help me with this I would be very grateful. Many thanks ---
**Author:** ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)\ **Post date:** [December 8, 2020, 8:25am UTC](https://community.mp3tag.de/t/prefix-title-with-composer-lastname/51069/2 "2020-12-08T08:25:13Z")
An action of the type "Format value" for TITLE Format string: `$regexp(%composer%,',.*',): %title%` ---
**Author:** ![LyricsLover](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/l/c6cbf5/32.png) [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)\ **Post date:** [December 8, 2020, 8:46am UTC](https://community.mp3tag.de/t/prefix-title-with-composer-lastname/51069/3 "2020-12-08T08:46:23Z")
> [@Noteworthy](#): > > Title should read: Bach: Sonata No. 1 in E-flat major BWV 525 Just a side note: You know that you can't copy this TITLE tag to rename your filename because of the - at least for windows - [illegal character](https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#naming-conventions) : (colon) after your composer name? ---
**Author:** ![Noteworthy](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/n/bc79bd/32.png) [@Noteworthy](https://community.mp3tag.de/u/Noteworthy)\ **Post date:** [December 8, 2020, 9:24am UTC](https://community.mp3tag.de/t/prefix-title-with-composer-lastname/51069/4 "2020-12-08T09:24:27Z")
Thank you very much, Ohrenkino. Much appreciate it. LyricsLover, thank for pointing it out! I'll just replace the colon with a hyphen in Ohrenkino's expression. Thanks once again to both of you. ---
**Author:** ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)\ **Post date:** [December 8, 2020, 9:34am UTC](https://community.mp3tag.de/t/prefix-title-with-composer-lastname/51069/5 "2020-12-08T09:34:39Z")
If the whole business is about renaming files, then I would not temper with the tag fields but use a corresponding mask to create just the filename. And if the task is to separate pieces of information that do not really belong together, then a separator would be useful that is usually not part of everyday writing. The hyphen, unfortunately, is. A good approximation is usually the underscore `_`. ---
**Author:** ![Noteworthy](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/n/bc79bd/32.png) [@Noteworthy](https://community.mp3tag.de/u/Noteworthy)\ **Post date:** [December 8, 2020, 9:59am UTC](https://community.mp3tag.de/t/prefix-title-with-composer-lastname/51069/6 "2020-12-08T09:59:08Z")
Thankfully, this is not about remaining files (that's aleady accomplished) but about identifying the composer in track titles. Thanks all the same for clearing it up. It adds to my understanding. ---
**Author:** ![Noteworthy](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/n/bc79bd/32.png) [@Noteworthy](https://community.mp3tag.de/u/Noteworthy)\ **Post date:** [December 8, 2020, 10:01am UTC](https://community.mp3tag.de/t/prefix-title-with-composer-lastname/51069/7 "2020-12-08T10:01:41Z")
Sorry, renaming files .. not remaining files 🙄 ---
**Author:** ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)\ **Post date:** [January 7, 2021, 10:01am UTC](https://community.mp3tag.de/t/prefix-title-with-composer-lastname/51069/8 "2021-01-07T10:01:45Z")
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