On Thu, Mar 28, 2013 at 5:49 PM, Mark Engelberg <mark.engelb...@gmail.com>wrote:
> I'm on 1.5.1 and I get that too, but even though:
> (pr #"a\nb") prints in a sane, readable way
> (pr (re-pattern "a\nb")) does not.
>
> The latter is what I need to print in a nice way.
>
Sorry, I missed that fine point.
When you say a "sane, readable way", do you mean human-readable, or
readable via clojure.core/read or clojure.core/read-string?
If the latter, then it already does print that way:
user=> (def p1 (re-pattern "a\nb"))
#'user/p1
user=> (def p2 (read-string (pr-str p1)))
#'user/p2
user=> p1
#"a
b"
user=> p2
#"a
b"
If you want clojure.core/read'ability but no actual newline character, I
don't think there is any way to create a syntax with #"" and only
non-newline characters between the quotes, such that the resulting regex
will contain the three characters a,newline,b as the original did.
If you don't need clojure.core/read'ability, then you can make up whatever
format you like, e.g. print the regex as a string with some type tag to
identify it as a regex. This might even be readable by making your own
data-reader for it:
(defn print-regex-my-way [re]
(print "#regex \"" (str re) "\""))
Note: clojure.core/read and read-string are not safe to read from anything
but trusted data sources, so I wouldn't recommend it for anything except
files you write yourself, or code. See here for details if you are curious:
http://clojuredocs.org/clojure_core/clojure.core/read
Also note that the new clojure.edn/read and read-string, and the edn
readers in the tools.reader contrib library, don't read Java regexes. This
is by choice, I believe, with the reason given that regexes are not
portable across Java, JavaScript, etc. platforms.
https://github.com/edn-format/edn/issues/26
Andy
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