Neil Schemenauer suggested a small improvement to one of the example REs.

Doc/lib/libre.tex

@@ -822,7 +822,7 @@ offers some more-or-less equivalent mappings between
   \lineii{\code{\%o}}
          {\regexp{0[0-7]*}}
   \lineii{\code{\%s}}
-         {\regexp{[\textasciicircum\e s]+}}
+         {\regexp{\e S+}}
   \lineii{\code{\%u}}
          {\regexp{\e d+}}
   \lineii{\code{\%x}, \code{\%X}}