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That's with DFA minimization. Also, '\w' has 311 states while '(?-u)\w' has 5 states.
I don't have a precise definition of enormous or impractical. Does it matter? I suppose one obvious one is when DFA construction time starts having a significant impact on total search times.
> Additionally, the results are not the same: the number of matches is not equal to 7882. How could I make `\w` conform to other regex implementations in ripgrep?
By following UTS#18: https://unicode.org/reports/tr18/#word
Most regex engines make \w be ASCII-only by default. But most also have a way to opt into Unicode-aware mode. RE2, Go's regexp and ECMAScript are popular regex engines that have no way to change the interpretation of \w.
> Fair question how regex compilers handle nefarious regexes. Go does not handle NFA with more than 1000 states, and, as you observed, we added some more restrictions when processing the NFA. It can be an interesting academic exercise to find monstrous regexes, but we haven't encountered useful regexes that hit these limits. But I guess you know some...
It's definitely not academic. People use regexes for lexers. People use big regexes to recognize certain things like email addresses and dates. Here's a real regex used in real software to identify dates in unstructured text for example: https://github.com/akoumjian/datefinder/blob/5376ece0a522c44...
Otherwise, as I hinted at above, the thing that can make regexes very large very quickly is when you mix Unicode classes with counted repetitions. It doesn't take a lot to make them "big."
HTML Datetime related posts
Index
| Project | Stars | |
|---|---|---|
| 1 | datefinder | 625 |
| 2 | Sherlock | 519 |
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