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.
"It was a dark and terrifying time and difficult to get updates from the hospital. I feared the worst every time the phone rang," recalled Rivka.
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Honor's humanoid robot. (Image by Mat Smith for Engadget)Image by Mat Smith