diff --git a/py-packages/markslider/markslider/markslider.py b/py-packages/markslider/markslider/markslider.py
index d211749..9b25211 100755
--- a/py-packages/markslider/markslider/markslider.py
+++ b/py-packages/markslider/markslider/markslider.py
@@ -20,7 +20,7 @@
 """Markslider: a slideshow engine based on markdown."""
 
 __author__ = "Ville Rantanen <ville.q.rantanen@gmail.com>"
-__version__ = "1.3.1"
+__version__ = "1.3.2"
 
 import sys, os, argparse, re, datetime
 from argparse import ArgumentParser
@@ -73,8 +73,8 @@ class slide_reader:
         self.max_width = None
         self.max_height = None
         self.data = []
-        self.re_image_convert = re.compile("(.*)(!\[.*\])\((.*)\)>")
-        self.re_command = re.compile("(.*)`(.*)`>(.*)")
+        self.re_image_convert = re.compile(r"(.*)(!\[.*\])\((.*)\)>")
+        self.re_command = re.compile(r"(.*)`(.*)`>(.*)")
         # ~ self.control_chars = ''.join(map(unichr, range(0,32) + range(127,160)))
         # ~ self.control_char_re = re.compile('[%s]' % re.escape(self.control_chars))
         self.background = []
@@ -207,19 +207,19 @@ class slide_reader:
             if self.opts.toc_depth > 1:
                 for line in page:
                     title = line.strip("# ")
-                    if re.search("^##[^#]", line):
+                    if re.search(r"^##[^#]", line):
                         subh = [subh[0] + 1, 0, 0]
                         TOC.append("    %d.%d. %s" % (h1 + 1, subh[0], title))
                     if self.opts.toc_depth == 2:
                         continue
-                    if re.search("^###[^#]", line):
+                    if re.search(r"^###[^#]", line):
                         subh = [subh[0], subh[1] + 1, 0]
                         TOC.append(
                             "        %d.%d.%d. %s" % (h1 + 1, subh[0], subh[1], title)
                         )
                     if self.opts.toc_depth == 3:
                         continue
-                    if re.search("^####[^#]", line):
+                    if re.search(r"^####[^#]", line):
                         subh = [subh[0], subh[1], subh[2] + 1]
                         TOC.append(
                             "            %d.%d.%d.%d. %s"
@@ -863,7 +863,7 @@ def colorify(s, opts):
 def cut_line(s, i):
     """cut a color tagged string, and remove control chars"""
     s = s[:i]
-    s = re.sub("\$$", "", re.sub("\$\{$", "", re.sub("\$\{.$", "", s)))
+    s = re.sub(r"\$$", "", re.sub(r"\$\{$", "", re.sub(r"\$\{.$", "", s)))
     return s
 
 
@@ -888,16 +888,16 @@ def launch(reader, opts, offset):
         return
     s = reader.get_current_page()[offset[1]]
     urls = re.findall(
-        "http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+",
+        r"http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+",
         s,
     )
-    images = re.findall("!\[[^]]+\]\([^\)]+\)", s)
+    images = re.findall(r"!\[[^]]+\]\([^\)]+\)", s)
     # sanity check
     if s.find("`") == -1 and len(urls) == 0 and len(images) == 0:
         return
 
-    run_command = re.match("(.*)`(.*)`!(.*)", s)
-    show_command = re.match("(.*)`(.*)`>(.*)", s)
+    run_command = re.match(r"(.*)`(.*)`!(.*)", s)
+    show_command = re.match(r"(.*)`(.*)`>(.*)", s)
     if show_command != None:
         output = subprocess.check_output(show_command.group(2).strip(), shell=True)
         if type(output) == bytes:
@@ -936,7 +936,7 @@ def launch(reader, opts, offset):
         )
         return
     if len(images) > 0:
-        image = re.sub(".*\(([^\)]+)\).*", "\\1", images[0])
+        image = re.sub(r".*\(([^\)]+)\).*", "\\1", images[0])
         subprocess.call(
             "%s '%s' &"
             % (