are you're talking about Flex Connector reading CSV-files (i.e. sdkfilereader)? It seems like the parser always treats the delimiter value as a literal and not as a regex. So unfortunately it is not possible. Two suggestions:
- If you're ok with a literal SPACE as delimiter use "\ " without the qotation marks
- I you really need the character class, switch to regex-parser and build a regex that mimics CSV-behavior e.g. (\\S+)\\s(\\S+)
I was able to select "other" from the drop down, go to the next box where you would input your custom delimiter and hit the space bar. I was able to go through and it parsed just fine.