Regex - Renaming file to highest resolution in filename

Question

I'm using an application called Advanced Renamer to rename my video files. I try to rename video files by selecting the highest quality available, which is specified inside the current filename itself.

For example an original untoched filename looks like: 1080P,720P,480P,240P,_123456789.mp4

Im using regex to rename this example file to: 1080P_123456789.mp4.

However, the result of the regex I'm using right now .*(?=1080P|720P|480P|240P) does not work properly, it's taking the lowest quality instead of the highest: 240P,_123456789.mp4

Correct examples:

1080P,720P,480P,240P,_0987654321.mp4  --> 1080P_0987654321.mp4
720P,480P,_0987654321.mp4             --> 720P_0987654321.mp4
480P,240P,_0987654321.mp4             --> 480P_0987654321.mp4

Wrong examplesmy regex is giving me:

1080P,720P,480P,240P,_0987654321.mp4  --> 240P_0987654321.mp4
720P,480P,_0987654321.mp4             --> 480P_0987654321.mp4
480P,240P,_0987654321.mp4             --> 240P_0987654321.mp4

Edit: Solution

^.*?(1080P|720P|480P|240P).*?(_\d+\.mp4).*$
OR 
^.*?(\d+P).*?_(\d+\.mp4)\S*
OR
.*?(\d+P)[^.]*_(\d+\.mp4)\S*

Answer 1

Try this ^(1080P|720P|480P|240P).*,(.*). The ^ will match the first occurance in the line.

Answer 2

For the current example data, you could capture the first occurrence in a capturing group as that is the highest value.

Then match any char except an underscore afterwards using a negated character class followed by an underscore to make sure it is there.

\b(\d+P)\b[^_]*_

Explanation

• \b Word boundary
• (\d+P) Capture group 1, match 1+ digits and P
• \b Word boundary
• [^_]*_ Match 0+ times any char except _, then match an _

Regex demo

In the replacement use the first capturing group followed by the matched underscore which was part of the match and is not present in the capturing group.

---

If you also want to remove what comes before the digits and P and after .mp4 with the specific numbers:

^.*?(1080P|720P|480P|240P).*?(_\d+\.mp4).*$

Regex demo

In the replacement use both capturing groups $1$2