The HTTP Sampler (and defaults) allow an RE to be specified that URLs must match. It can be tricky to negate REs, so it might be useful to add an optional RE field that URLs must not match (as is done for the HTTP Proxy Server). It might also be worth considering making the fields tables, rather than single entries. However, this would be trickier to implement whilst still retaining upwards compatibility of JMX files.
The tabular field did indeed not get implemented, but rather the simpler approach of an additional field. *** This bug has been marked as a duplicate of bug 63527 ***
This issue has been migrated to GitHub: https://github.com/apache/jmeter/issues/2920