Dynamically changing sampler name in a JMeter test

This came up when a user was reading URL's from a file and needed to extract out a value from the Response that he wanted to use as the sampler name (so that his report would show this information)

The solution is roughly
a. Extract out the comment using regex post processor or equivalent
b. Add a BeanShell Post Processor  as child of the sampler write code like
prev.setSampleLabel(vars.get("

variablenamefromstepa")); => replace the name with the value you extracted