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diff --git a/io_convert_image_to_mesh_img/pvl/patterns.py b/io_convert_image_to_mesh_img/pvl/patterns.py
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+# This file is a part of the HiRISE DTM Importer for Blender
+#
+# Copyright (C) 2017 Arizona Board of Regents on behalf of the Planetary Image
+# Research Laboratory, Lunar and Planetary Laboratory at the University of
+# Arizona.
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""PVL Regular Expression Patterns"""
+
+import re
+
+# End of PVL File
+END = re.compile(
+    r'\s* \bEND\b \s*', (re.VERBOSE + re.IGNORECASE)
+)
+
+# PVL Comment
+COMMENT = re.compile(
+    r'/\* .*? \*/', (re.DOTALL + re.VERBOSE)
+)
+
+# PVL Statement
+STATEMENT = re.compile(
+    r"""
+    \s* (?P<key>\w+) # Match a PVL key
+    \s* = \s* # Who knows how many spaces we encounter
+    (?P<val> # Match a PVL value
+        ([+-]?\d+\.?\d*) # We could match a number
+        | (['"]?((\w+ \s*?)+)['"]?) # Or a string
+    )
+    (\s* <(?P<units>.*?) >)? # The value may have an associated unit
+    """, re.VERBOSE
+)
+
+# Integer Number
+INTEGER = re.compile(
+    r"""
+    [+-]?(?<!\.)\b[0-9]+\b(?!\.[0-9])
+    """, re.VERBOSE
+)
+
+# Floating Point Number
+FLOATING = re.compile(
+    r"""
+    [+-]?\b[0-9]*\.?[0-9]+
+    """, re.VERBOSE
+)