From da0a1ae86c794f788612ad5b0ca07b68c08a37e0 Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Tue, 17 Feb 2026 22:15:52 +0000
Subject: [PATCH 1/4] tests: confirm ilike/like newline matching bug

Add failing tests that demonstrate % and _ wildcards in like/ilike
do not match across newline characters.
---
 .../db/tests/query/compiler/evaluators.test.ts  | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/packages/db/tests/query/compiler/evaluators.test.ts b/packages/db/tests/query/compiler/evaluators.test.ts
index 68e08d7ea..26478d04d 100644
--- a/packages/db/tests/query/compiler/evaluators.test.ts
+++ b/packages/db/tests/query/compiler/evaluators.test.ts
@@ -374,6 +374,23 @@ describe(`evaluators`, () => {
           // In 3-valued logic, ilike with undefined pattern returns UNKNOWN (null)
           expect(compiled({})).toBe(null)
         })
+
+        it(`like % wildcard matches across newline characters`, () => {
+          const func = new Func(`like`, [
+            new Value(`hello\nworld`),
+            new Value(`%world`),
+          ])
+          const compiled = compileExpression(func)
+
+          expect(compiled({})).toBe(true)
+        })
+
+        it(`like _ wildcard matches a newline character`, () => {
+          const func = new Func(`like`, [new Value(`a\nb`), new Value(`a_b`)])
+          const compiled = compileExpression(func)
+
+          expect(compiled({})).toBe(true)
+        })
       })
 
       describe(`comparison operators`, () => {

From d20bb60c61cc34daae280a54a28301b12dc7cb40 Mon Sep 17 00:00:00 2001
From: Laurent Direr <4263535+ldirer@users.noreply.github.com>
Date: Wed, 18 Feb 2026 11:04:16 +0100
Subject: [PATCH 2/4] tests: add ilike with newline e2e test

---
 .../src/fixtures/seed-data.ts                 |  1 +
 .../src/suites/predicates.suite.ts            | 21 +++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/packages/db-collection-e2e/src/fixtures/seed-data.ts b/packages/db-collection-e2e/src/fixtures/seed-data.ts
index 98b979404..818f2acf2 100644
--- a/packages/db-collection-e2e/src/fixtures/seed-data.ts
+++ b/packages/db-collection-e2e/src/fixtures/seed-data.ts
@@ -68,6 +68,7 @@ export function generateSeedData(): SeedDataResult {
       `Rose ${i}`,
       `sam ${i}`,
       `Tina ${i}`,
+      `Ursula ${i}\nNewline`,
     ]
     const name = names[i % names.length]
 
diff --git a/packages/db-collection-e2e/src/suites/predicates.suite.ts b/packages/db-collection-e2e/src/suites/predicates.suite.ts
index 2b3a9b216..eef75f7dc 100644
--- a/packages/db-collection-e2e/src/suites/predicates.suite.ts
+++ b/packages/db-collection-e2e/src/suites/predicates.suite.ts
@@ -412,6 +412,27 @@ export function createPredicatesTestSuite(
         await query.cleanup()
       })
 
+      it(`should filter with like() with wildcard pattern matching newline`, async () => {
+        const config = await getConfig()
+        const usersCollection = config.collections.onDemand.users
+
+        const query = createLiveQueryCollection((q) =>
+          q
+            .from({ user: usersCollection })
+            .where(({ user }) => like(user.name, `Ursula%`)),
+        )
+
+        await query.preload()
+        await waitForQueryData(query, { minSize: 1 })
+
+        const results = Array.from(query.state.values())
+        expect(results.length).toBeGreaterThan(0)
+        // should match names starting with "Ursula" even if it contains a newline character
+        assertAllItemsMatch(query, (u) => u.name.startsWith(`Ursula`))
+
+        await query.cleanup()
+      })
+
       it(`should filter with like() with lower() function`, async () => {
         const config = await getConfig()
         const usersCollection = config.collections.onDemand.users

From f93a4786b21688c37ebf69fef20e81de5dca4ee6 Mon Sep 17 00:00:00 2001
From: Laurent Direr <4263535+ldirer@users.noreply.github.com>
Date: Wed, 18 Feb 2026 10:36:52 +0100
Subject: [PATCH 3/4] fix: make like % match newline characters

---
 packages/db/src/query/compiler/evaluators.ts     | 3 ++-
 packages/query-db-collection/e2e/query-filter.ts | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/packages/db/src/query/compiler/evaluators.ts b/packages/db/src/query/compiler/evaluators.ts
index 1e2637a73..bd13aac64 100644
--- a/packages/db/src/query/compiler/evaluators.ts
+++ b/packages/db/src/query/compiler/evaluators.ts
@@ -516,6 +516,7 @@ function evaluateLike(
   regexPattern = regexPattern.replace(/%/g, `.*`) // % matches any sequence
   regexPattern = regexPattern.replace(/_/g, `.`) // _ matches any single char
 
-  const regex = new RegExp(`^${regexPattern}$`)
+  // 's' (dotAll flag) makes '.' match all characters including line terminations
+  const regex = new RegExp(`^${regexPattern}$`, 's')
   return regex.test(searchValue)
 }
diff --git a/packages/query-db-collection/e2e/query-filter.ts b/packages/query-db-collection/e2e/query-filter.ts
index 43f4d0e87..aa3de76b1 100644
--- a/packages/query-db-collection/e2e/query-filter.ts
+++ b/packages/query-db-collection/e2e/query-filter.ts
@@ -556,7 +556,7 @@ function evaluateLike(
   regexPattern = regexPattern.replace(/%/g, `.*`) // % matches any sequence
   regexPattern = regexPattern.replace(/_/g, `.`) // _ matches any single char
 
-  const regex = new RegExp(`^${regexPattern}$`)
+  const regex = new RegExp(`^${regexPattern}$`, 's')
   return regex.test(searchValue)
 }
 

From 90eea960ae2ca8c3c3181de92e024f4bc94f8024 Mon Sep 17 00:00:00 2001
From: Laurent Direr <4263535+ldirer@users.noreply.github.com>
Date: Wed, 18 Feb 2026 12:58:03 +0100
Subject: [PATCH 4/4] changeset

---
 .changeset/nice-months-nail.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/nice-months-nail.md

diff --git a/.changeset/nice-months-nail.md b/.changeset/nice-months-nail.md
new file mode 100644
index 000000000..54ee79419
--- /dev/null
+++ b/.changeset/nice-months-nail.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/db': patch
+---
+
+Fix like/ilike `%` and `_` not matching newline characters