Build regular expressions at compile time

input/system/google_cloudsql/logs.go

@@ -169,6 +169,9 @@ func SetupLogSubscriber(ctx context.Context, wg *sync.WaitGroup, globalCollectio
 	return nil
 }
 
+// AlloyDB adds a special [filename:lineno] prefix to all log lines (not part of log_line_prefix)
+var alloyPrefix = regexp.MustCompile(`(?s)^\[[\w.-]+:\d+\]  (.*)`)
+
 func setupLogTransformer(ctx context.Context, wg *sync.WaitGroup, servers []*state.Server, in <-chan LogStreamItem, out chan state.ParsedLogStreamItem, logger *util.Logger) {
 	wg.Add(1)
 	go func() {
@@ -203,14 +206,12 @@ func setupLogTransformer(ctx context.Context, wg *sync.WaitGroup, servers []*sta
 					continue
 				}
 
-				parser := server.GetLogParser()
-
 				// We ignore failures here since we want the per-backend stitching logic
 				// that runs later on (and any other parsing errors will just be ignored).
 				// Note that we need to restore the original trailing newlines since
 				// AnalyzeStreamInGroups expects them and they are not present in the GCP
 				// log stream.
-				logLine, _ := parser.ParseLine(in.Content + "\n")
+				logLine, _ := server.GetLogParser().ParseLine(in.Content + "\n")
 				logLine.OccurredAt = in.OccurredAt
 
 				// Ignore loglines which are outside our time window
@@ -219,8 +220,7 @@ func setupLogTransformer(ctx context.Context, wg *sync.WaitGroup, servers []*sta
 				}
 
 				if isAlloyDBCluster {
-					// AlloyDB adds a special [filename:lineno] prefix to all log lines (not part of log_line_prefix)
-					parts := regexp.MustCompile(`(?s)^\[[\w.-]+:\d+\]  (.*)`).FindStringSubmatch(string(logLine.Content))
+					parts := alloyPrefix.FindStringSubmatch(string(logLine.Content))
 					if len(parts) == 2 {
 						logLine.Content = parts[1]
 					}

logs/querysample/querysample.go

@@ -117,13 +117,14 @@ func TransformLogMinDurationStatementToQuerySample(logLine state.LogLine, queryT
 	return sample, true
 }
 
+// Regular expression to find all values in single quotes or NULL
+// Query Parameters example: $1 = 'foo', $2 = '123', $3 = NULL, $4 = 'bo”o'
+var valueRegexp = regexp.MustCompile(`(?:(NULL)|'((?:[^']|'')*)')`)
+
 func findQueryParameters(paramText string) []null.String {
 	// Handle Query Parameters (available from Postgres 16+)
 	var parameters []null.String
-	// Regular expression to find all values in single quotes or NULL
-	// Query Parameters example: $1 = 'foo', $2 = '123', $3 = NULL, $4 = 'bo''o'
-	re := regexp.MustCompile(`(?:(NULL)|'((?:[^']|'')*)')`)
-	for _, part := range re.FindAllString(paramText, -1) {
+	for _, part := range valueRegexp.FindAllString(paramText, -1) {
 		if part == "NULL" {
 			parameters = append(parameters, null.NewString("", false))
 		} else {

util/clean_http_error.go

@@ -6,10 +6,11 @@ import (
 	"regexp"
 )
 
+var regex = regexp.MustCompile("(?i): (get|post|patch) ")
+
 // Removes duplicate URLs added by retryablehttp
 func CleanHTTPError(error error) error {
 	message := fmt.Sprintf("%v", error)
-	regex := regexp.MustCompile("(?i): (get|post|patch) ")
 	array := regex.Split(message, -1)
 	return errors.New(array[len(array)-1])
 }