If-satement in --exec

[hollysheep]

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I have youtube-dl running on my raspberry pi and it checks every 10min if there is a new video in my youtube playlist. i add them when i'm not at home and the videos are downloaded then. i want to run some commands if the file title contains a specific uploader_id because i have to re-encode the videos with ffmpeg. when i try something like this

youtube-dl --merge-output-format mkv -f 'worstvideo[ext!=webm]+worstaudio[ext!=webm]/best[ext!=webm]' -o '%(timestamp)s-%(release_date)s-%(upload_date)s-%(uploader_id)s'.mkv URL --exec 'if [[ {} =~ <uloader_id> ]]; then touch /home/user/file; fi'

This test should create an empty file when the file title contains the uploader_id. Running this results in this error:

/bin/sh: 1: [[: not found

When i run the command with single brackets i have this error:

/bin/sh: 1: [: NA-NA-20190913-uploader_id.mkv: unexpected operator

[dstftw]

Move code to sh script and run it in --exec.