On Thursday, March 28, 2013 5:36:45 PM UTC-7, Andy Fingerhut wrote: > > I don't understand why (re-pattern "a\\\nb") would match the same thing. > I would have guessed that it wouldn't, but it does indeed do so. For all I > know that could be bug or weird dark corner case in the Java regex > library. I would have expected such a regex to match the only the > 4-character sequence a,backslash,newline,b. > > That's a string with four characters: a, backslash, newline, b. When the regex engine compiles that, it sees the backslash-newline construct as "unnecessary escaping" of the newline character: since newline is neither a metacharacter nor alphabetic, backslash-newline just matches the single character newline.
The j.u.regex.Pattern javadoc, in explaining backslash-quoting, contains: "It is an error to use a backslash prior to any alphabetic character that does not denote an escaped construct; these are reserved for future extensions to the regular-expression language. A backslash may be used prior to a non-alphabetic character regardless of whether that character is part of an unescaped construct." -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
