diff --git a/.github/verify_header.sh b/.github/verify_header.sh
index 42ddc01..d17f64d 100755
--- a/.github/verify_header.sh
+++ b/.github/verify_header.sh
@@ -5,20 +5,32 @@
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
+# COPYRIGHT_REGEX is lowercase, because the whole line is
+# converted to lowercase before test against this regex.
+COPYRIGHT_REGEX="(copyright|\(c\))\s*([0-9]{4}(\s*-\s*([0-9]{4}))?)"
+LICENSE_REGEX="SPDX-License-Identifier: BSD-3-Clause$"
 YEAR=$(date +"%Y")
-REGEX="Copyright\(c\) [0-9]{4}-([0-9]{4}) |Copyright\(c\) ([0-9]{4}) "
 
-while read -r line; do
-    if [[ "$line" =~ $REGEX ]]; then
-        echo ${BASH_REMATCH[0]}
-        if [[ $YEAR == ${BASH_REMATCH[1]} || $YEAR == ${BASH_REMATCH[2]} ]]; then
-            echo $1 have appropriate license header
-            exit 0
-        fi
-        echo $1 have wrong license header year
-	exit 1
-    fi
+unset copyright_header license_header
+
+# Read lines until proper copyright and license headers are found.
+while read -r line && [[ ! "$copyright_header" || ! "$license_header" ]]; do
+	if [[ "${line,,}" =~ $COPYRIGHT_REGEX ]]; then
+		# If the fourth regex group (from year range) doesn't exist,
+		# use the second regex group instead (from a single year).
+		copyright_year=${BASH_REMATCH[4]:-${BASH_REMATCH[2]}}
+
+		if [[ $copyright_year == $YEAR ]]; then
+			copyright_header="correct_copyright_header_found"
+		fi
+	elif [[ "$line" =~ $LICENSE_REGEX ]]; then
+		license_header="correct_license_header_found"
+	fi
 done < "$1"
 
-echo $1 does not contain appropriate license header
+# Proper copyright and license info were found - all good.
+[[ "$copyright_header" && "$license_header" ]] && exit 0
+
+[[ ! "$copyright_header" ]] && echo >&2 "error: file '$1' does not contain any appropriate copyright info"
+[[ ! "$license_header" ]] && echo >&2 "error: file '$1' does not contain appropriate license identifier"
 exit 1