diff --git a/src/libs/100_output_print.sh b/src/libs/100_output_print.sh
index c706a19..e484146 100644
--- a/src/libs/100_output_print.sh
+++ b/src/libs/100_output_print.sh
@@ -18,7 +18,7 @@ _pr_echo_raw() {
             interpret_chars='-e'
         fi
         ctrlchar=$($g_echo_cmd $interpret_chars "\033")
-        msg=$($g_echo_cmd $interpret_chars "$msg" | sed -r "s/$ctrlchar\[([0-9][0-9]?(;[0-9][0-9]?)?)?m//g")
+        msg=$($g_echo_cmd $interpret_chars "$msg" | sed -E "s/$ctrlchar\[([0-9][0-9]?(;[0-9][0-9]?)?)?m//g")
     fi
     if [ "$g_echo_cmd_type" = printf ]; then
         if [ "$opt" = "-n" ]; then
diff --git a/src/libs/350_cpu_detect2.sh b/src/libs/350_cpu_detect2.sh
index e77d11d..f2df9d7 100644
--- a/src/libs/350_cpu_detect2.sh
+++ b/src/libs/350_cpu_detect2.sh
@@ -164,7 +164,7 @@ parse_cpu_details() {
 
     # also define those that we will need in other funcs
     # taken from https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/include/asm/intel-family.h
-    # curl -s 'https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/arch/x86/include/asm/intel-family.h' | awk '/#define INTEL_FAM6/ {print $2"=$(( "$3" )) # "$4,$5,$6,$7,$8,$9}' | sed -re 's/ +$//'
+    # curl -s 'https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/arch/x86/include/asm/intel-family.h' | awk '/#define INTEL_FAM6/ {print $2"=$(( "$3" )) # "$4,$5,$6,$7,$8,$9}' | sed -Ee 's/ +$//'
     # shellcheck disable=SC2034
     {
         readonly INTEL_FAM6_CORE_YONAH=$((0x0E))           #
diff --git a/src/libs/380_hw_microcode.sh b/src/libs/380_hw_microcode.sh
index f490e08..80e6b82 100644
--- a/src/libs/380_hw_microcode.sh
+++ b/src/libs/380_hw_microcode.sh
@@ -53,7 +53,7 @@ is_latest_known_ucode() {
             continue
         fi
         ucode=$(($(echo "$tuple" | cut -d, -f4)))
-        ucode_date=$(echo "$tuple" | cut -d, -f5 | sed -r 's=(....)(..)(..)=\1/\2/\3=')
+        ucode_date=$(echo "$tuple" | cut -d, -f5 | sed -E 's=(....)(..)(..)=\1/\2/\3=')
         pr_debug "is_latest_known_ucode: with cpuid $cpu_cpuid has ucode $cpu_ucode, last known is $ucode from $ucode_date"
         ret_is_latest_known_ucode_latest=$(printf "latest version is 0x%x dated $ucode_date according to $g_mcedb_info" "$ucode")
         if [ "$cpu_ucode" -ge "$ucode" ]; then