On Wednesday 03 December 2008 11:57, Blaine wrote:
> I want to build a regular expression pattern literal (I think that's
> what they're called) like #"a.*" out of separate strings like "a" and
> ".*".
>
> user> (re-seq #"a.*" "bab") ; this is cool
> ("ab")
> user> (re-seq #(str "a" ".*") "bab") ; but this, in all its
> noobness, is not
> ; Evaluation aborted.
> user> #(str "a" ".*")
> #<user$eval__4569$fn__4571 [EMAIL PROTECTED]> ; what
> is this thing? can I use it somehow?
You're using a reader notation unrelated to regular expressions.
Instead, #(...) is a shorthand notation for an anonymous function
definition.
In this case, you'll have to build up the textual form of the pattern
(being careful to use all the necessary extra backslashes) and then
when that's complete, use (re-pattern ...) to turn that string into a
Pattern instance.
Perhaps more easily, you can combine the string concatenation with the
Pattern compilation in a single form:
(re-pattern (str "a" ".*" "b"))
or
(re-seq (re-pattern (str "a" ".*" "b")) "babba")
user=> (re-seq (re-pattern (str "a" ".*" "b")) "babba")
("abb")
> I appreciate the help.
>
> - Blaine
Randall Schulz
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