# Problem getting Tag to Tag change to stick ie be saved to file

**URL:** <https://community.mp3tag.de/t/problem-getting-tag-to-tag-change-to-stick-ie-be-saved-to-file/48224>\
**Category:** Support\
**Created:** [March 22, 2020, 10:16am UTC](https://community.mp3tag.de/t/problem-getting-tag-to-tag-change-to-stick-ie-be-saved-to-file/48224 "2020-03-22T10:16:32Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![GregB](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/g/da6949/32.png) [@GregB](https://community.mp3tag.de/u/GregB)\
**Post date:** [March 22, 2020, 10:16am UTC](https://community.mp3tag.de/t/problem-getting-tag-to-tag-change-to-stick-ie-be-saved-to-file/48224/1 "2020-03-22T10:16:32Z")

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I have a situation where I wish to truncate the first 3 characters from the 'Title' field using Tag to Tag conversion. I have entered %TITLE% in the field box, and $mid(%title%,4,20) in the Format string box, and this has appeared to change '13 Unchained Melody' to 'Unchained Melody' but it does not save it to file. There is nothing I can do to make it 'stick' but I am sure I was using the same process recently for this application. I have also found that I can't use non-capitals in the field box. Can you help me resolve this?

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**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:** [March 22, 2020, 10:23am UTC](https://community.mp3tag.de/t/problem-getting-tag-to-tag-change-to-stick-ie-be-saved-to-file/48224/2 "2020-03-22T10:23:28Z")

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> [@GregB](#):
>
> I have entered %TITLE% in the field box

It should only be TITLE without the %

In addition if you want to strip the leading number, consider using a regular expression that remove a number, irrespective of the actual length.

`$regexp(%title%,^\d+ ,)`

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**Author:** ![GregB](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/g/da6949/32.png) [@GregB](https://community.mp3tag.de/u/GregB)\
**Post date:** [March 22, 2020, 10:30am UTC](https://community.mp3tag.de/t/problem-getting-tag-to-tag-change-to-stick-ie-be-saved-to-file/48224/3 "2020-03-22T10:30:55Z")

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Brilliant - don't understand why I was using the % before and after the field title. It certainly works without them - but they have to be in the format field - right? Funny how the preview seemed to be working. Thanks a lot.

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**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:** [March 22, 2020, 10:36am UTC](https://community.mp3tag.de/t/problem-getting-tag-to-tag-change-to-stick-ie-be-saved-to-file/48224/4 "2020-03-22T10:36:02Z")

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The %xxx% retrieves the contents of a field, the string.  
The name without % refers to the name of a field.  
So the answer to

> [@GregB](#):
>
> but they have to be in the format field - right?

is "yes" as you want to use the string that is found in that field for the treatment. You could also enter string constants and/or combinations of string constants and string variables.

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**Author:** ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)\
**Post date:** [April 21, 2020, 10:36am UTC](https://community.mp3tag.de/t/problem-getting-tag-to-tag-change-to-stick-ie-be-saved-to-file/48224/5 "2020-04-21T10:36:14Z")

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