diff --git a/tools/pm3_tests.sh b/tools/pm3_tests.sh
index 42ecb5eb3..f682d3491 100755
--- a/tools/pm3_tests.sh
+++ b/tools/pm3_tests.sh
@@ -193,7 +193,7 @@ function CheckExecute() {
   for I in $RETRY
   do
     RES=$(eval "$2")
-    if echo "$RES" | egrep -q "$3"; then
+    if echo "$RES" | grep -E -q "$3"; then
       echo -e "[ ${C_GREEN}OK${C_NC} ] ${C_OK}"
       return $RESULT
     fi
@@ -315,7 +315,7 @@ while true; do
       HT2CRACK3NRAR=hitag2_${HT2CRACK3UID}_nrar_${HT2CRACK3N}emul.txt
       if ! CheckExecute "ht2crack3 gen testfile"           "cd $HT2CRACK3PATH; python3 ../hitag2_gen_nRaR.py $HT2CRACK3KEY $HT2CRACK3UID $HT2CRACK3N > $HT2CRACK3NRAR && echo SUCCESS" "SUCCESS"; then break; fi
       if ! CheckExecute "ht2crack3test test"               "cd $HT2CRACK3PATH; ./ht2crack3test $HT2CRACK3NRAR $HT2CRACK3KEY $HT2CRACK3UID|grep -v SUCCESS||echo SUCCESS" "SUCCESS"; then break; fi
-      if ! CheckExecute "ht2crack3 test"                   "cd $HT2CRACK3PATH; ./ht2crack3 $HT2CRACK3UID $HT2CRACK3NRAR |egrep -v '(trying|partial)'" "key = $HT2CRACK3KEY"; then break; fi
+      if ! CheckExecute "ht2crack3 test"                   "cd $HT2CRACK3PATH; ./ht2crack3 $HT2CRACK3UID $HT2CRACK3NRAR |grep -E -v '(trying|partial)'" "key = $HT2CRACK3KEY"; then break; fi
       if ! CheckExecute "ht2crack3 rm testfile"            "cd $HT2CRACK3PATH; rm $HT2CRACK3NRAR && echo SUCCESS" "SUCCESS"; then break; fi
 
       echo -e "\n${C_BLUE}Testing ht2crack4:${C_NC} ${HT2CRACK4PATH:=./tools/hitag2crack/crack4/}"