diff --git a/bin/euscan_patch_metadata b/bin/euscan_patch_metadata
index 746fd2e..449b253 100755
--- a/bin/euscan_patch_metadata
+++ b/bin/euscan_patch_metadata
@@ -119,11 +119,11 @@ def get_deb_url(name):
         content = opened.read()
 
         for link in BeautifulSoup(content, parseOnlyThese=SoupStrainer("a")):
-            if re.match("[^\s]+\.debian\.tar\.(?:gz|bz2)", link.text):
+            if re.match(r"[^\s]+\.debian\.tar\.(?:gz|bz2)", link.text):
                 deb_url = link["href"]
                 deb_type = "source"
                 break
-            if re.match("[^\s]+\.diff\.gz", link.text):
+            if re.match(r"[^\s]+\.diff\.gz", link.text):
                 deb_url = link["href"]
                 deb_type = "diff"
                 break
@@ -157,7 +157,7 @@ def patch_metadata(package, watch_data, diff=False):
     for watch_line in watch_data.split("\n"):  # there can be multiple lines
         watch_line = " ".join(watch_line.split())  # remove extra spaces and \n
 
-        version_parse = re.match("version=(\d+?)", watch_line)
+        version_parse = re.match(r"version=(\d+?)", watch_line)
         if version_parse:
             version = version_parse.group(1)
             continue
diff --git a/src/euscan/__init__.py b/src/euscan/__init__.py
index ab046a2..fff04d8 100644
--- a/src/euscan/__init__.py
+++ b/src/euscan/__init__.py
@@ -74,13 +74,13 @@ BRUTEFORCE_BLACKLIST_URLS = [
 ROBOTS_TXT_BLACKLIST_DOMAINS = [
     "(.*)sourceforge(.*)",
     "(.*)github.com",
-    "(.*)qt\.nokia\.com(.*)",
-    "(.*)chromium\.org(.*)",
-    "(.*)nodejs\.org(.*)",
-    "(.*)download\.mono-project\.com(.*)",
-    "(.*)fedorahosted\.org(.*)",
-    "(.*)download\.tuxfamily\.org(.*)",
-    "(.*)festvox\.org(.*)",
+    r"(.*)qt\.nokia\.com(.*)",
+    r"(.*)chromium\.org(.*)",
+    r"(.*)nodejs\.org(.*)",
+    r"(.*)download\.mono-project\.com(.*)",
+    r"(.*)fedorahosted\.org(.*)",
+    r"(.*)download\.tuxfamily\.org(.*)",
+    r"(.*)festvox\.org(.*)",
 ]
 
 from euscan.out import EuscanOutput  # noqa: E402
diff --git a/src/euscan/handlers/generic.py b/src/euscan/handlers/generic.py
index 62304ec..69220ad 100644
--- a/src/euscan/handlers/generic.py
+++ b/src/euscan/handlers/generic.py
@@ -122,7 +122,7 @@ def scan_directory_recursive(cp, ver, rev, url, steps, orig_url, options):
 
     results = []
 
-    if re.search(b"<\s*a\s+[^>]*href", data, re.I):
+    if re.search(rb"<\s*a\s+[^>]*href", data, re.I):
         results.extend(scan_html(data, url, pattern))
     elif url.startswith("ftp://"):
         results.extend(scan_ftp(data, url, pattern))
diff --git a/src/euscan/handlers/php.py b/src/euscan/handlers/php.py
index e661490..b4c9438 100644
--- a/src/euscan/handlers/php.py
+++ b/src/euscan/handlers/php.py
@@ -20,7 +20,7 @@ def can_handle(pkg, url=None):
 
 
 def guess_package_and_channel(cp, url):
-    match = re.search("http://(.*)\.php\.net/get/(.*)-(.*).tgz", url)
+    match = re.search(r"http://(.*)\.php\.net/get/(.*)-(.*).tgz", url)
 
     if match:
         host = match.group(1)
diff --git a/src/euscan/handlers/pypi.py b/src/euscan/handlers/pypi.py
index aa09027..5e3465c 100644
--- a/src/euscan/handlers/pypi.py
+++ b/src/euscan/handlers/pypi.py
@@ -19,7 +19,7 @@ def can_handle(pkg, url=None):
 
 
 def guess_package(cp, url):
-    match = re.search("mirror://pypi/\w+/(.*)/.*", url)
+    match = re.search(r"mirror://pypi/\w+/(.*)/.*", url)
     if match:
         return match.group(1)
 
diff --git a/src/euscan/handlers/url.py b/src/euscan/handlers/url.py
index 8662510..a856534 100644
--- a/src/euscan/handlers/url.py
+++ b/src/euscan/handlers/url.py
@@ -24,7 +24,7 @@ def can_handle(*args):
 
 
 def handle_directory_patterns(base, file_pattern):
-    """
+    r"""
     Directory pattern matching
     e.g.: base: ftp://ftp.nessus.org/pub/nessus/nessus-([\d\.]+)/src/
           file_pattern: nessus-core-([\d\.]+)\.tar\.gz
diff --git a/src/euscan/helpers.py b/src/euscan/helpers.py
index 605479d..03a68c1 100644
--- a/src/euscan/helpers.py
+++ b/src/euscan/helpers.py
@@ -383,9 +383,9 @@ def regex_from_template(template):
     regexp = re.escape(template)
 
     # Unescape specific stuff
-    regexp = regexp.replace("\$\{", "${")
-    regexp = regexp.replace("\}", "}")
-    regexp = regexp.replace("}\.$", "}.$")
+    regexp = regexp.replace(r"\$\{", "${")
+    regexp = regexp.replace(r"\}", "}")
+    regexp = regexp.replace(r"}\.$", "}.$")
 
     # Replace ${\d+}
     # regexp = regexp.replace('${0}', r'([\d]+?)')
diff --git a/src/euscan/out.py b/src/euscan/out.py
index 43dad06..f28cb94 100644
--- a/src/euscan/out.py
+++ b/src/euscan/out.py
@@ -74,7 +74,7 @@ def progress_bar():
 
 def clean_colors(string):
     if isinstance(string, str):
-        string = re.sub("\033\[[0-9;]+m", "", string)
+        string = re.sub(r"\033\[[0-9;]+m", "", string)
         string = re.sub(r"\\u001b\[[0-9;]+m", "", string)
         string = re.sub(r"\x1b\[[0-9;]+m", "", string)
     return string
diff --git a/src/euscan/version.py b/src/euscan/version.py
index 0b8290a..84d6a71 100644
--- a/src/euscan/version.py
+++ b/src/euscan/version.py
@@ -22,7 +22,7 @@ def get_version_type(version):
     if "9999" in version or "99999999" in version:
         return "live"
 
-    for token in re.findall("[\._-]([a-zA-Z]+)", version):
+    for token in re.findall(r"[\._-]([a-zA-Z]+)", version):
         if token in gentoo_types:
             types.append(token)
     if types: