Exclude using regex filtering

[asdffdsa (jojothehumanmonkey)]

@AeroMaxx

Not sure if the two curly brackets are specific to Go itself or rclone, but that probably should be mentioned somewhere.

tl;dr - rclone and it is mentioned, tho confusing.
"The regular expressions used are as defined in the Go regular expression reference.
Regular expressions should be enclosed in {{ }}"

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well, for a bit of background, i once tried to use regex, which worked but should not have. in fact a bug.

Rclone copy using regex expression using include multiple expression for file name

That is a very interesting answer and shouldn't work at all because rclone filter strings are file globs not regexps. However it does work... I think the reason it works is actually a bug. Rclone translates the filters into regular expressions (you can see them with -vv --dump filters), but it is dumping the \d straight into the regexp which it shouldn't be - it should be escaping the \.. This means that any of the regexp \ chars will work in the glob which wasn't unintended certainly! So I…

which lead to this github issue.
filter: add `{{ regexp }}` syntax to pattern matches - fixes #4074 by ncw · Pull Request #5700 · rclone/rclone · GitHub