It looks like regular expressions are the only type with built-in
syntax that don't have a predicate function. How about:
(def
^{:arglists '([x])
:doc "Return true if x is a regular expression
(java.util.regex.Pattern)"
:added "1.3"}
re? (fn re? [x] (instance? java.util.regex.Pattern x)))
Or maybe call it "regexp?" if "re?" isn't clear enough...
-Jeff
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