The first thing we have to do with a command-line, which we haven't done so far, is to take user input. This can be done with the following code:
If you are familiar with SMT-LIB you may notice that both the re.from_ecma2020 function and the single-quote string notation ('regex') are nonstandard additions in Ostrich. That's because the regexes in SMT-LIB are textbook regexes without most of the features of full perl-compatible regular expressions, and because they end up needing a lot of escaping in practical use, some of which is nontrivial.
，这一点在体育直播中也有详细论述
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