diff --git a/css_html_js_minify/css_minifier.py b/css_html_js_minify/css_minifier.py
index 1bb7c17..580310f 100644
--- a/css_html_js_minify/css_minifier.py
+++ b/css_html_js_minify/css_minifier.py
@@ -291,7 +291,7 @@ def restore_needed_space(css):
 
 def unquote_selectors(css):
     """Fix CSS for some specific selectors where Quotes is not needed."""
-    return re.compile('([a-zA-Z]+)="([a-zA-Z0-9-_\.]+)"]').sub(r'\1=\2]', css)
+    return re.compile(r'([a-zA-Z]+)="([a-zA-Z0-9-_\.]+)"]').sub(r'\1=\2]', css)
 
 
 def css_minify(css, wrap=False, comments=False, sort=False, noprefix=False):
diff --git a/css_html_js_minify/html_minifier.py b/css_html_js_minify/html_minifier.py
index da9b646..520ba9d 100644
--- a/css_html_js_minify/html_minifier.py
+++ b/css_html_js_minify/html_minifier.py
@@ -106,10 +106,10 @@ def unquote_html_attributes(html):
     space1 = re.compile(r'\w\s+\w', re.MULTILINE)
     space2 = re.compile(r'"\s+>', re.MULTILINE)
     space3 = re.compile(r"'\s+>", re.MULTILINE)
-    space4 = re.compile('"\s\s+\w+="|\'\s\s+\w+=\'|"\s\s+\w+=|\'\s\s+\w+=',
+    space4 = re.compile(r'"\s\s+\w+="|\'\s\s+\w+=\'|"\s\s+\w+=|\'\s\s+\w+=',
                         re.MULTILINE)
     space6 = re.compile(r"\d\s+>", re.MULTILINE)
-    quotes_in_tag = re.compile('([a-zA-Z]+)="([a-zA-Z0-9-_\.]+)"')
+    quotes_in_tag = re.compile(r'([a-zA-Z]+)="([a-zA-Z0-9-_\.]+)"')
     # iterate on a for loop cleaning stuff up on the html markup.
     for tag in iter(any_tag.findall(html)):
         # exceptions of comments and closing tags