Show HN: I wrote a book on Python regular expressions

Re:Show HN: I wrote a book on Python regular expressions by jazzyjackson on Thursday August 08, 2019 @03:54PM (#20648019)

wow I didn't know you could concatenate regexes, thanks

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Re:Show HN: I wrote a book on Python regular expressions by gnulinux on Thursday August 08, 2019 @04:04PM (#20648101)

Why not? They're just strings until they're compiled. "Code is data"

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Re:Show HN: I wrote a book on Python regular expressions by CaptainMarvel on Thursday August 08, 2019 @05:19PM (#20648901)

The thought of doing this literally didn’t occur to me... I think this is great!

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Re:Show HN: I wrote a book on Python regular expressions by jazzyjackson on Thursday August 08, 2019 @10:18PM (#20650817)

Well I suppose the r in front of them in python made them look just enough "not a normal string" for me to forget how the + operator might act.

My day-to-day experience is in nodejs, where adding one regex object to another coerces them to normal strings first

[edit: hey neat, the hackernews form strips emoji from comments, I wonder if that's just ranges of unicode or if there's some crazy regex going on :D]

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Re:Show HN: I wrote a book on Python regular expressions by baudehlo on Friday August 09, 2019 @09:20AM (#20654016)

In Javascript you just need to wrap in `new RegExp(r1 + r2 + r3)`.

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