Day 19 part 2: some bash cleanup

OUTPUT

@@ -429,17 +429,3 @@ ex2.bash : res=20394514442037
 ex12-c : res=20394514442037
 	time: 0:00.00 real, 0.00 user, 0.00 sys
 	context-switch:	0+1, page-faults: 0+74
-
-=========================================
-================= day19 =================
-=========================================
-
-+++++++++++++++++ ex1
-ex1.bash : res=285
-	time: 0:00.56 real, 0.55 user, 0.00 sys
-	context-switch:	12+1, page-faults: 0+5967
-
-+++++++++++++++++ ex2
-ex2.bash : res=412
-	time: 0:03.37 real, 3.34 user, 0.03 sys
-	context-switch:	19+1, page-faults: 0+11909

day19/OUTPUT

@@ -1,8 +0,0 @@
-ex1.bash : res=285
-	time: 0:00.56 real, 0.55 user, 0.00 sys
-	context-switch:	12+1, page-faults: 0+5967
-
-ex2.bash : res=412
-	time: 0:03.37 real, 3.34 user, 0.03 sys
-	context-switch:	19+1, page-faults: 0+11909
-

day19/README

@@ -54,6 +54,8 @@ Your goal is to determine the number of messages that completely match rule 0. I
 How many messages completely match rule 0?
 
 Your puzzle answer was 285.
+
+The first half of this puzzle is complete! It provides one gold star: *
 --- Part Two ---
 
 As you look over the list of messages, you realize your matching rules aren't quite right. To fix them, completely replace rules 8: 42 and 11: 42 31 with the following:
@@ -136,10 +138,8 @@ However, after updating rules 8 and 11, a total of 12 messages match:
 
 After updating rules 8 and 11, how many messages completely match rule 0?
 
-Your puzzle answer was 412.
+Answer:
 
-Both parts of this puzzle are complete! They provide two gold stars: **
+Although it hasn't changed, you can still get your puzzle input.
 
-At this point, you should return to your Advent calendar and try another puzzle.
-
-If you still want to see it, you can get your puzzle input.
+You can also [Share] this puzzle.

day19/ex2.bash

@@ -8,8 +8,8 @@ shopt -s extglob
 
 declare -a RULE=() MATCH=() STRING=()
 # shellcheck disable=SC2034
-declare var_0 rule8 rule11
-declare -i res=0
+declare var_0
+declare -i res=0 MAXPROF=0
 
 # build a regexp use-able by bash =~ operator.
 # Recursively replace rules, until we get final text values.
@@ -23,6 +23,8 @@ function buildtree {
     shift 2
     local args=$* res="" arg t
 
+    ((prof > MAXPROF)) && MAXPROF=$prof
+
     for arg in $args; do
         if [[ -z "${arg/[|ab]}" ]]; then
             res+="$arg"
@@ -71,19 +73,21 @@ done
 # 2) calculate rule 8 and 11 with some "guessed" minimum possible value
 # 3) build rule 0
 
-# result is "stable" from this value
+# result starts to be "stable" from this value
 SOME_LIMIT=5
 
 buildtree 1 var_0 42
 buildtree 1 var_0 31
-rule8="${MATCH[42]}+"
-rule11="${MATCH[42]}${MATCH[31]}"
+tmp8="(${MATCH[42]})+"
+tmp11="(${MATCH[42]}${MATCH[31]})"
 for ((i=2; i<SOME_LIMIT; ++i)); do
-    rule11+="|${MATCH[42]}{$i}${MATCH[31]}{$i}"
+    tmp11+="|((${MATCH[42]}){$i}(${MATCH[31]}){$i})"
 done
-MATCH[8]="$rule8"
-MATCH[11]="($rule11)"
+MATCH[8]="$tmp8"
+MATCH[11]="($tmp11)"
 buildtree 1 var_0 0
+
+res=0
 for str in "${STRING[@]}"; do
     [[ "$str" =~ ^${MATCH[0]}$ ]] && ((res++))
 done