diff --git a/day-03/internal/one/solve.go b/day-03/internal/one/solve.go
index ed6824c..92a2ac1 100644
--- a/day-03/internal/one/solve.go
+++ b/day-03/internal/one/solve.go
@@ -9,7 +9,7 @@ import (
 	"github.com/onyx-and-iris/aoc2024/day-03/internal/util"
 )
 
-var reMul = regexp.MustCompile(`mul\((?P<first>[0-9]{1,3}),(?P<second>[0-9]{1,3})\)`)
+var reMul = regexp.MustCompile(`mul\(([0-9]{1,3}),([0-9]{1,3})\)`)
 
 func Solve(data []byte) (int, error) {
 	r := bytes.NewReader(data)
@@ -26,10 +26,9 @@ func parseLines(r io.Reader) (int, error) {
 
 	scanner := bufio.NewScanner(r)
 	for scanner.Scan() {
-		m := reMul.FindAllString(scanner.Text(), -1)
-		for _, v := range m {
-			groups := util.GetGroups(reMul, v)
-			sum += util.MustConv(groups["first"]) * util.MustConv(groups["second"])
+		matches := reMul.FindAllStringSubmatch(scanner.Text(), -1)
+		for _, m := range matches {
+			sum += util.MustConv(m[1]) * util.MustConv(m[2])
 		}
 	}
 
diff --git a/day-03/internal/two/solve.go b/day-03/internal/two/solve.go
index c3132a4..2a1e3a5 100644
--- a/day-03/internal/two/solve.go
+++ b/day-03/internal/two/solve.go
@@ -11,7 +11,7 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
-var reMulOrDoOrDont = regexp.MustCompile(`mul\((?P<first>[0-9]{1,3}),(?P<second>[0-9]{1,3})\)|do\(\)|don't\(\)`)
+var reMulOrDoOrDont = regexp.MustCompile(`mul\(([0-9]{1,3}),([0-9]{1,3})\)|do\(\)|don't\(\)`)
 
 func Solve(data []byte) (int, error) {
 	r := bytes.NewReader(data)
@@ -29,9 +29,9 @@ func parseLines(r io.Reader) (int, error) {
 
 	scanner := bufio.NewScanner(r)
 	for scanner.Scan() {
-		m := reMulOrDoOrDont.FindAllString(scanner.Text(), -1)
-		for _, v := range m {
-			switch v {
+		matches := reMulOrDoOrDont.FindAllStringSubmatch(scanner.Text(), -1)
+		for _, m := range matches {
+			switch m[0] {
 			case "do()":
 				do = true
 				log.Debug("hit a do")
@@ -41,10 +41,9 @@ func parseLines(r io.Reader) (int, error) {
 			}
 
 			if do {
-				groups := util.GetGroups(reMulOrDoOrDont, v)
-				if groups["first"] != "" && groups["second"] != "" {
-					log.Debugf("%s * %s\n", groups["first"], groups["second"])
-					sum += util.MustConv(groups["first"]) * util.MustConv(groups["second"])
+				if m[1] != "" && m[2] != "" {
+					log.Debugf("%s * %s\n", m[1], m[2])
+					sum += util.MustConv(m[1]) * util.MustConv(m[2])
 				}
 			}
 		}
diff --git a/day-03/internal/util/util.go b/day-03/internal/util/util.go
index 35c11e3..b02895e 100644
--- a/day-03/internal/util/util.go
+++ b/day-03/internal/util/util.go
@@ -1,21 +1,9 @@
 package util
 
 import (
-	"regexp"
 	"strconv"
 )
 
-func GetGroups(r *regexp.Regexp, s string) map[string]string {
-	groups := make(map[string]string)
-	names := r.SubexpNames()
-	for i, res := range r.FindStringSubmatch(s) {
-		if i != 0 {
-			groups[names[i]] = res
-		}
-	}
-	return groups
-}
-
 func MustConv(s string) int {
 	n, err := strconv.Atoi(s)
 	if err != nil {