To standardize Titles I would like to move the key of a piece, however not to the end of the title. Is this possible ? If so how could I realise this in an Action? Actually, it is selecting a specific text, then move this text to a certain place

Examples
Change
'Trio for piano, violin and cello nr.1 in g minor, Hob.XV - I. Moderato'
to
'Trio for piano, violin and cello Hob.XV, no.1 in g minor - I. Moderato'

Change
'Waltz for piano in a minor, op.12/1'
to
'Waltz for piano op.12/1 in a minor'

Thanks in advance for any help

Thanks very much for your reply.

The representation of the key differs not just in English but also substantially between the representation in English, German or Dutch (not to mention French and Italian. See for some convenient tables here:

https://nl.wikipedia.org/wiki/Toonsoort and https://de.wikipedia.org/wiki/Tonart.

Unfortunately the English Wikipedia lemma does not show such table.

In my case (Dutch) the keys are represented as follows

[b]Dutch (English)[/u]

A groot (A Major)
a klein (A Minor)

Bes groot (B flat Major)
bes klein (B flat minor)

B groot (B Major)
b klein (B Minor)

C groot (C Major)
c klein (C Minor)

D groot (D Major)
d klein (D Minor)

Es groot (E flat Major)
es klein (E flat Minor)

E groot (E Major)
e klein (E Minor)

F groot (F Major)
f klein (F Minor)

Fis groot (F sharp Major)
fis klein (F sharp Minor)

G groot (G Major)
g klein (G Minor)

As groot (A flat Major)
as klein (A flat Minor)

Hope very much that this helps, since it is undoable to achieve this manually for 80.000+ tracks. Once again thanks for your effort

For myself in Dutch would do. I constructed a simple Action for converting the German keys into Dutch (actually a set of 53 replacements). With your Action I could change these converted Dutch files

That's correct.
In the first example the work contains several movements (f.i. a symphony). In the second example the work consists of one movement (f.i. a Chopin work for piano)

Basically these are the two variants. Of course the parts of the title in the examples "Hob.XV" and "op.12/1" vary per composer.
Once again thanks for your efforts!

The examples seem to work out fine. Thanks!

As concerns the "nr.1", not all works have a (correct) number. In other words, in the title the only certainty is the phrase "in g klein" the key of the work. While diving deeper into this I realise that there is another complication as concerns the place where the key is dropped.

In the library standard* the key of a work is in most cases placed at the end of the title or if applicable, before the movement indicator (as in example 2). However, if a work has a nickname or is an arrangement or is a specific version (f.i. early version or a revision) the key is placed before those indicators.

So according to these standards the works are titled as follows:

[WORK] [NUMBER] [CATALOGUE NUMBER] [KEY] [nickname or incipit] other indicators such as [ARR.] [VERSION] then - [MOVEMENT NUMBER in Roman numerals]. then [TEMPO].

For my personal use, where applicable I added
[recording type] if other than studio [Live]
[audio resolution] if higher than cd [HiRes]

Trio·for·piano,·violin·and·cello·nr.1·Hob.XV·in·g·klein·-·I.·Moderato

breaks down into
[WORK] Trio·for·piano,·violin·and·cello]·
[NUMBER] [nr.1]·
CATALOGUE NUMBER [Hob.XV]
[KEY] [in·g·klein]
·-· (separator)
[MOVEMENT NUMBER] [I.]
[TEMPO or name] [Moderato]

Example 3 with nick name
Symfonie nr.1 in Bes-groot, op.38 ('Frühlingssinfonie') - I. Andante un poco maestoso – Allegro molto vivace,
the action should change this to
Symfonie nr.1, op.38 in Bes-groot ('Frühlingssinfonie') - I. Andante un poco maestoso – Allegro molto vivace

Example 4
[WORK] [NUMBER] [KEY] [VERSION] [CATALOGUE NUMBER] [SEPARATOR] [MOVEMENT NUMBER] [TEMPO] [recording type] [audio resolution]
Symfonie nr.1 in c-klein [Wiener Fassung 1890/91], WAB101 - I. Allegro [Live] [HiRes]
no change necessary.

Hope this clarifies a bit what I would like to achieve with the action.

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* If you would be unfamiliar with classical music let me further explain why I trouble you with my hassles. Opposed to (most) popular music, in classical music the same work of a composer is often performed by different artists (soloists, orchestras etc.) or in other settings (symphony played by small ensemble instead), therefore distinction between these is key. My goal is to standardise titles in my own collection to quickly find all versions or a specific version of a work, therefore I am renaming the titles to follow the library standards used in The Netherlands.