Correct the RE equivalent of scanf()'s %x and %X patterns.
Closes SF bug #572169.
diff --git a/Doc/lib/libre.tex b/Doc/lib/libre.tex
index 5ab8d84..3531e82 100644
--- a/Doc/lib/libre.tex
+++ b/Doc/lib/libre.tex
@@ -862,7 +862,7 @@
   \lineii{\code{\%u}}
          {\regexp{\e d+}}
   \lineii{\code{\%x}, \code{\%X}}
-         {\regexp{0[xX][\e dA-Fa-f]}}
+         {\regexp{0[xX][\e dA-Fa-f]+}}
 \end{tableii}
 
 To extract the filename and numbers from a string like