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If his market is "programmers who will pay for a regex debugger", it's probably much smaller than 99% of all programmers (and as a sibling comment pointed out, "programmers" are a much smaller market than many other).

Programmer market is ~12M. I agree that very few will pay though.

http://stackoverflow.com/questions/453880/how-many-developer...

I think his point is the market overall.

Yes it's a huge share of programmers, I'd say 80-90% for your first example 95%+ for your second. But compare that market to the market for Dropbox, or AirBnB, or Amazon.

If you're market is "programmers" it's already a pretty minute fraction of the general population.

Yes, but: I can't remember the last time u wrote a comes reflex. I've since learned to use an xpath parser, for example.