diff --git a/highbeam b/highbeam
index 24527ed..8bdbca2 100755
--- a/highbeam
+++ b/highbeam
@@ -15,6 +15,10 @@ RULES=(
     "q.\{0,3\}r" "$H$Y" # q*r with maximum 3 characters in between. color bright yellow
 )
 --------------------
+Rules can be also exressed as comma separated list variable:
+export HB_RULES='\''[0-9],$C,g,$Y'\''
+   HB_RULES are appended to other rules
+
 Color variables:  $R $G $B $Y $M $C $W $BLACK
 Modify to bright version by prefixing with $H  (e.g. $H$G)
 Background colors: $BGR $BGG $BGB $BGY $BGC $BGM $BGW 
@@ -53,6 +57,7 @@ BGM="${E}45m"
 BGC="${E}46m"
 BGW="${E}47m"
 
+
 CONF_FILE=~/.highbeamrc
 CONF_LINE=""
 FLAGS="ig"
@@ -76,11 +81,13 @@ done
     
 [[ -z "$CONF_LINE" ]] && {
     # user rules:
-    [[ -e "${CONF_FILE}" ]] && . "${CONF_FILE}" || {
-        echo You may have wrong format in "${CONF_FILE}" >&2 
-        usage >&2
-        exit 1
-    }
+    [[ -e "${CONF_FILE}" ]] && {
+        . "${CONF_FILE}" || {
+            echo You may have wrong format in "${CONF_FILE}" >&2 
+            usage >&2
+            exit 1
+        }
+    } 
     for (( r=0; r<${#RULES[@]}; r++ ));
     do  REGEX="$REGEX -e 's/\(${RULES[$r]}\)/${RULES[$(( $r + 1 ))]}\1${Z}/${FLAGS}'"
         r=$(( $r + 1 ))
@@ -92,8 +99,22 @@ done
         r=$(( $r + 1 ))
     done
 }
-eval sed $REGEX || echo Maybe errors in your rules: "$REGEX" >&2
-
+# env variable fed rules
+[[ -z "$HB_RULES" ]] || {
+    CONF_ENV=( $( eval echo "$HB_RULES" ) )
+    for (( r=0; r<${#CONF_ENV[@]}; r++ ));
+    do  REGEX="$REGEX -e 's/\(${CONF_ENV[$r]}\)/${CONF_ENV[$(( $r + 1 ))]}\1${Z}/${FLAGS}'"
+        r=$(( $r + 1 ))
+    done
+}
+#~ echo ${CONF_ENV[@]}
+#~ echo $HB_RULES
+#~ echo $REGEX
+[[ -z "$REGEX" ]] && {
+    cat -
+} || {
+    eval sed $REGEX || echo Maybe errors in your rules: "$REGEX" >&2
+}