diff --git a/esphome/components/display_menu_base/__init__.py b/esphome/components/display_menu_base/__init__.py
index c9a0c7ee93..9125c43f0c 100644
--- a/esphome/components/display_menu_base/__init__.py
+++ b/esphome/components/display_menu_base/__init__.py
@@ -119,7 +119,7 @@ DisplayMenuOnPrevTrigger = display_menu_base_ns.class_(
 
 
 def validate_format(format):
-    if re.search(r"^%([+-])*(\d+)*(\.\d+)*[fg]$", format) is None:
+    if re.search(r"^%[+-]*(\d+)?(\.\d+)?[fg]$", format) is None:
         raise cv.Invalid(
             f"{CONF_FORMAT}: has to specify a printf-like format string specifying exactly one f or g type conversion, '{format}' provided"
         )
diff --git a/esphome/components/ens160_base/__init__.py b/esphome/components/ens160_base/__init__.py
index 3b6ad8a4ee..46c53c3b10 100644
--- a/esphome/components/ens160_base/__init__.py
+++ b/esphome/components/ens160_base/__init__.py
@@ -24,7 +24,6 @@ CODEOWNERS = ["@vincentscode", "@latonita"]
 ens160_ns = cg.esphome_ns.namespace("ens160_base")
 
 CONF_AQI = "aqi"
-UNIT_INDEX = "index"
 
 CONFIG_SCHEMA_BASE = cv.Schema(
     {
diff --git a/esphome/components/font/__init__.py b/esphome/components/font/__init__.py
index c8813bf1bc..a1339a4bc1 100644
--- a/esphome/components/font/__init__.py
+++ b/esphome/components/font/__init__.py
@@ -238,7 +238,7 @@ def validate_font_config(config):
     return config
 
 
-FONT_EXTENSIONS = (".ttf", ".woff", ".otf", "bdf", ".pcf")
+FONT_EXTENSIONS = (".ttf", ".woff", ".otf", ".bdf", ".pcf")
 
 
 def validate_truetype_file(value):
diff --git a/esphome/components/shelly_dimmer/light.py b/esphome/components/shelly_dimmer/light.py
index c1e9cad358..1688f9d6a6 100644
--- a/esphome/components/shelly_dimmer/light.py
+++ b/esphome/components/shelly_dimmer/light.py
@@ -67,7 +67,7 @@ KNOWN_FIRMWARE = {
 
 
 def parse_firmware_version(value):
-    match = re.match(r"(\d+).(\d+)", value)
+    match = re.fullmatch(r"(\d+)\.(\d+)", value)
     if match is None:
         raise ValueError(f"Not a valid version number {value}")
     major = int(match[1])
@@ -129,7 +129,7 @@ def validate_firmware(value):
 
 def validate_sha256(value):
     value = cv.string(value)
-    if not value.isalnum() or not len(value) == 64:
+    if not re.fullmatch(r"[0-9a-fA-F]{64}", value):
         raise ValueError(f"Not a valid SHA256 hex string: {value}")
     return value