At Sun, 22 Apr 2018 14:54:26 +0200, Zelphir Kaltstahl wrote: > I am sorry, I think I am still misunderstanding it. > > When I try: > > (regexp-try-match #rx"^[1-9]+[0-9]*$" (current-input-port)) > > It also results immediately in: > > #f
Using stdin both for reading an expresion and getting input can be confusing. At Racket's ">" prompt, when you run > (regexp-try-match #rx"^[1-9]+[0-9]*$" (current-input-port)) by hitting Return, then a newline is included is in the input stream just after the `(regexp-try-match ...)` expression. That newline is still there when you try to match against the regexp, so the match fails. DrRacket separates the input stream for expressions and for `current-input-port`. So, if you try that expression in DrRacket's interactions area, and if you hit the "EOF" button (to the right of the input box) instead of Return after a number, then you should get a match. Note that if you hit Return after the number, then it won't match even in DrRacket, because the input port will have a newline after the number. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
