diff --git a/lib/guessit/fileutils.py b/lib/guessit/fileutils.py
index 2087c17..4e052b6 100644
--- a/lib/guessit/fileutils.py
+++ b/lib/guessit/fileutils.py
@@ -87,4 +87,5 @@ def load_file_in_same_dir(ref_file, filename):
             zfile = zipfile.ZipFile(zfilename)
             return zfile.read('/'.join(path[i + 1:]))
 
-    return u(io.open(os.path.join(*path), encoding='utf-8').read())
+    with io.open(os.path.join(*path), encoding='utf-8') as fh:
+        return u(fh.read())
diff --git a/lib/guessit/language.py b/lib/guessit/language.py
index 7f51b2c..45c0c28 100644
--- a/lib/guessit/language.py
+++ b/lib/guessit/language.py
@@ -172,7 +172,7 @@ class Language(UnicodeMixin):
     'pob'
     """
 
-    _with_country_regexp = re.compile('(.*)\((.*)\)')
+    _with_country_regexp = re.compile(r'(.*)\((.*)\)')
     _with_country_regexp2 = re.compile('(.*)-(.*)')
 
     def __init__(self, language, country=None, strict=False, scheme=None):
diff --git a/lib/guessit/patterns.py b/lib/guessit/patterns.py
index 447e24d..90a6d92 100644
--- a/lib/guessit/patterns.py
+++ b/lib/guessit/patterns.py
@@ -140,7 +140,7 @@ prop_multi = { 'format': { 'DVD': [ 'DVD', 'DVD-Rip', 'VIDEO-TS', 'DVDivX' ],
                                'DTS': [ 'DTS' ],
                                'AAC': [ 'He-AAC', 'AAC-He', 'AAC' ] },
 
-               'audioChannels': { '5.1': [ r'5\.1', 'DD5[\._ ]1', '5ch' ] },
+               'audioChannels': { '5.1': [ r'5\.1', r'DD5[\._ ]1', '5ch' ] },
 
                'episodeFormat': { 'Minisode': [ 'Minisodes?' ] }
 
@@ -170,7 +170,7 @@ prop_single = { 'releaseGroup': [ 'ESiR', 'WAF', 'SEPTiC', r'\[XCT\]', 'iNT', 'P
                 }
 
 _dash = '-'
-_psep = '[-\. _]?'
+_psep = r'[-\. _]?'
 
 def _to_rexp(prop):
     return re.compile(prop.replace(_dash, _psep), re.IGNORECASE)
diff --git a/lib/guessit/textutils.py b/lib/guessit/textutils.py
index a1b7c4b..0c5d862 100644
--- a/lib/guessit/textutils.py
+++ b/lib/guessit/textutils.py
@@ -58,7 +58,7 @@ def clean_string(s):
     return result
 
 
-_words_rexp = re.compile('\w+', re.UNICODE)
+_words_rexp = re.compile(r'\w+', re.UNICODE)
 
 def find_words(s):
     return _words_rexp.findall(s.replace('_', ' '))