Merge pull request #13679 from mjtrangoni/fix-megacheck-issues

Fix megacheck issues

pkg/tsdb/graphite/graphite.go

@@ -164,14 +164,12 @@ func formatTimeRange(input string) string {
 
 func fixIntervalFormat(target string) string {
 	rMinute := regexp.MustCompile(`'(\d+)m'`)
-	rMin := regexp.MustCompile("m")
 	target = rMinute.ReplaceAllStringFunc(target, func(m string) string {
-		return rMin.ReplaceAllString(m, "min")
+		return strings.Replace(m, "m", "min", -1)
 	})
 	rMonth := regexp.MustCompile(`'(\d+)M'`)
-	rMon := regexp.MustCompile("M")
 	target = rMonth.ReplaceAllStringFunc(target, func(M string) string {
-		return rMon.ReplaceAllString(M, "mon")
+		return strings.Replace(M, "M", "mon", -1)
 	})
 	return target
 }

pkg/tsdb/stackdriver/stackdriver.go

@@ -186,8 +186,7 @@ func reverse(s string) string {
 }
 
 func interpolateFilterWildcards(value string) string {
-	re := regexp.MustCompile("[*]")
-	matches := len(re.FindAllStringIndex(value, -1))
+	matches := strings.Count(value, "*")
 	if matches == 2 && strings.HasSuffix(value, "*") && strings.HasPrefix(value, "*") {
 		value = strings.Replace(value, "*", "", -1)
 		value = fmt.Sprintf(`has_substring("%s")`, value)