Stack Overflow is About Solutions, Not Opinion Polls
SO is about solutions, not opinion polling. While some problems have more than one solution, questions that generate a list are simply not in the spirit of the site.
With that in mind, a question like "How can I test my regular expression against a corpus?" might elicit an answer that points out some appropriate tools, but it is essentially a problem-solving question. That would probably be on-topic.
On the other hand, "What is the best tool to test regular expressions?" would generate lists of tools, elicit subjective answers about which is "best" for various purposes, and generally fail to be canonical in any way. That would generally be closed as Not Constructive.
Ask "How" Instead
Instead of asking for a shopping list, ask how a particular task can be accomplished. Of course, it's best if you mention what you've already tried and why whatever you've tried doesn't work for you, but asking "how" will generally be better received than an open-ended question.