diff --git a/lib/lib-advent.org b/lib/lib-advent.org
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+#+title: A collection of helper functions for Advent of Code
+* inout manipulation
+#+begin_src emacs-lisp :results none
+      (require 'dash)
+      (defun advent/replace-multiple-regex-buffer (regex-list)
+        "Takes REGEX-LIST as an alist ( regex . replacement )
+  and applies each substitiution 
+  "
+          (insert-file-contents "input")
+          (goto-char (point-min))
+          (replace-regexp "\\([0-9]+\\),\\([0-9]+\\)" "(\\1 \\2)")
+          (goto-char (point-min))
+          (insert "(setq data '(")
+          (goto-char (point-max))
+          (insert "))")
+          (eval-buffer))
+      (setq width 71 ;71
+      	height 71
+      	start-pos '(0 0)
+      	end-pos (list (- width 1) (- height 1)))
+      (setq full-data data)
+#+end_src