I have an issue with the source file integration.
I try to configure the source file detection to detect only specific files, therefore I tried to work with the [set] part as a matcher. I used regexp here, so I tried the input that should match my files. Some of them are grabbed up, some no.
I’m new to Crowdin so any guidance would be appreciated.
Guess this one is what you’re looking for 
Crowdin has a limited set of regexp which can be used:
As a workaround, you can divide your existing folders into several separated, so you’d be able to group 'em by regexp, so system would support it just perfectly.
Or, as it do I, use asterisk, like *.json so path would be like /folder_for_crowdin/ **/ *.json