Use a regular expression to extract the streams from variables files.

[NParsonsMO]

CMEW/app/configure_standardise/bin/create_request_file.py the stream is currently extracted with

# Get the whole stream including substream
whole_stream = line.strip().split(":")[-1]

# But don't list the substream
stream = whole_stream.split("/")[0]

but this could be done more efficiently with a regular expression.