Replaces the first instance of 'pattern' in 'string' with 'replacement'. Like Ruby's 'String#sub'. If (ifn? replacement) is true, the replacement is called with the match.
; clojure/contrib/str_utils.clj:66 (defn re-sub [#^Pattern regex replacement #^String string] (if (ifn? replacement) (let [m (re-matcher regex string)] (if (.find m) (str (.subSequence string 0 (.start m)) (replacement (re-groups m)) (.subSequence string (.end m) (.length string))) string)) (.. regex (matcher string) (replaceFirst replacement))))
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