Feature description

It was noticed in the addition of #266, that there was a performance hit, possibly due to the use of the regex library. See #266 (comment) for a discussion.

A simple benchmark is timing the rcl graph tests before and after applying the change:

for i in {1..10}; do; /usr/bin/time -o time.txt -a --format "%E" build/rcl/test/test_graph__rmw_fastrtps_cpp; done
cat time.txt

On my machine,
before: 03.06 seconds
after: 04.28 seconds

Implementation considerations

We should try replacing the usage of regex and cutting down on string copies (as suggested) to see if performance can be improved.