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A comment on Show HN: Regular expression compilation visualized.

Re:Show HN: Regular expression compilation visualized by avereveard on Tuesday March 23, 2021 @09:15AM (#26554576)
most of the crazy email regexes found here https://stackoverflow.com/questions/201323/how-to-validate-a... fail to validate in the input field
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Re:Show HN: Regular expression compilation visualized by unhammer on Tuesday March 23, 2021 @09:30AM (#26554719)
Only regular expressions[0] can compile to FST's; Perl-style regexes aren't regular.

[0] https://en.wikipedia.org/wiki/Regular_language

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Re:Show HN: Regular expression compilation visualized by yakubin on Tuesday March 23, 2021 @09:21AM (#26554626)
That's probably, because the regexes you linked to are Perl-flavoured regexes, whereas this website seems to use the "Unix Extended" variant of regex.
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Re:Show HN: Regular expression compilation visualized by Cthulhu_ on Tuesday March 23, 2021 @09:57AM (#26555025)
If you want crazy, you should look up RegEx match open tags except XHTML self-contained tags.
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