Your original method worked for me. The method @Stephen_A_Marsh suggested also worked.
The only difference is that in your screenshot, the current filename is Behandlungen 45 Sek 1:1; Treatments 45 Sec 1:1;.mp4 Is that really the original filename or is it an aboration of the batch rename tool? I wouldn't think it's possible to have that filename in Windows.
My mistake, I didn't see the attachment in the OP when posting my original reply.
Please attach or link to a sample file/s that contains such metadata.
It would also be helpful if you could type out exactly the final desired result of the rename so that it is clear what you want.
This is the title
Behandlungen 45 Sek 1:1; Treatments 45 Sec 1:1
And I want to have filename
Behandlungen 45 Sek 1:1
Bridge will automatically change the : colon to a - hyphen, as colon's are an illegal filename character.
This screenshot shows an intermediate filename rather than the original filename with my previous regex: