From 103f369cee209f6f0a15ef953cff138ffa025a26 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Wed, 8 Apr 2026 21:59:10 +0300
Subject: task b: protect regex cache with RWMutex

---
 internal/ui/helpers_test.go | 49 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

(limited to 'internal/ui/helpers_test.go')

diff --git a/internal/ui/helpers_test.go b/internal/ui/helpers_test.go
index 9760277..1fe853b 100644
--- a/internal/ui/helpers_test.go
+++ b/internal/ui/helpers_test.go
@@ -3,7 +3,9 @@ package ui
 import (
 	"fmt"
 	"reflect"
+	"regexp"
 	"strings"
+	"sync"
 	"testing"
 	"time"
 
@@ -98,6 +100,52 @@ func TestFormatDueText(t *testing.T) {
 	}
 }
 
+func TestSearchRegexCacheConcurrentAccess(t *testing.T) {
+	searchRegexMu.Lock()
+	searchRegexCache = make(map[string]*regexp.Regexp)
+	searchRegexMu.Unlock()
+	t.Cleanup(func() {
+		searchRegexMu.Lock()
+		searchRegexCache = make(map[string]*regexp.Regexp)
+		searchRegexMu.Unlock()
+	})
+
+	patterns := []string{`alpha`, `beta`}
+	var wg sync.WaitGroup
+	errCh := make(chan error, 128)
+
+	for i := 0; i < 16; i++ {
+		for _, pattern := range patterns {
+			wg.Add(1)
+			go func(pattern string) {
+				defer wg.Done()
+
+				re, err := compileAndCacheRegex(pattern)
+				if err != nil {
+					errCh <- err
+					return
+				}
+				if re == nil || !re.MatchString(pattern) {
+					errCh <- fmt.Errorf("compiled regex for %q did not match", pattern)
+					return
+				}
+				if cached, ok := cachedSearchRegex(pattern); !ok || cached == nil {
+					errCh <- fmt.Errorf("missing cached regex for %q", pattern)
+				}
+			}(pattern)
+		}
+	}
+
+	wg.Wait()
+	close(errCh)
+
+	for err := range errCh {
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+}
+
 func TestValidateTagName(t *testing.T) {
 	tests := []struct {
 		name    string
@@ -414,6 +462,7 @@ func TestValidateRecurrence(t *testing.T) {
 		})
 	}
 }
+
 // TestParseFilterInput verifies that parseFilterInput correctly handles
 // taskwarrior filter expressions, including attribute filters (proj:xxx),
 // tag filters (+tag), quoted values (description:"some text"), and empty input.
-- 
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