note kennethk Please see [id://174051] Once you have a discrete test case that you have run through [mod://Devel::NYTProf], and as well run test cases with [doc://Benchmark] for versions both including and excluding [doc://study], we can help you understand your results. <p>You may also want to check out [doc://index], since you the regex engine is more power than you really need. <!-- Node text goes above. Div tags should contain sig only --> <div class="pmsig"><div class="pmsig-712372"> <hr /> <p>#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.</p> </div></div> 976237 976252