gnu: Add r-rematch.

* gnu/packages/statistics.scm (r-rematch): New variable.

gnu/packages/statistics.scm

@@ -3272,6 +3272,26 @@ noncentral hypergeometric distribution (also called extended hypergeometric
 distribution).")
    (license license:gpl3+)))
 
+(define-public r-rematch
+  (package
+    (name "r-rematch")
+    (version "1.0.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (cran-uri "rematch" version))
+       (sha256
+        (base32
+         "0y3mshvpvz9csmq8hk8jbabx4nxlv5sckvfzvm6920ndg34xw2d4"))))
+    (build-system r-build-system)
+    (home-page "https://github.com/MangoTheCat/rematch")
+    (synopsis "Match regular expressions with a nicer API")
+    (description
+     "This package provides a small wrapper on @code{regexpr} to extract the
+matches and captured groups from the match of a regular expression to a
+character vector.")
+    (license license:expat)))
+
 (define-public r-rpart
   (package
     (name "r-rpart")