diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index cdca0c074..f8baedae9 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -33,7 +33,6 @@ jobs:
     code_coverage:
         name: Code Coverage
         runs-on: ubuntu-latest
-        continue-on-error: true
         steps:
             - uses: actions/checkout@v6
             - uses: shivammathur/setup-php@v2
@@ -44,7 +43,8 @@ jobs:
 
             - run: composer install --no-progress --prefer-dist
             - run: composer tester -- -p phpdbg --coverage ./coverage.xml --coverage-src ./src
-            - run: wget https://github.com/php-coveralls/php-coveralls/releases/download/v2.4.3/php-coveralls.phar
-            - env:
-                  COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-              run: php php-coveralls.phar --verbose --config tests/.coveralls.yml
+              continue-on-error: true
+            - uses: coverallsapp/github-action@v2
+              with:
+                  file: coverage.xml
+                  format: clover
diff --git a/src/Utils/Validators.php b/src/Utils/Validators.php
index b11d7e1e6..ef624eb98 100644
--- a/src/Utils/Validators.php
+++ b/src/Utils/Validators.php
@@ -137,7 +137,9 @@ public static function assertField(
 	 */
 	public static function is(mixed $value, string $expected): bool
 	{
-		foreach (explode('|', $expected) as $item) {
+		$items = explode('|', $expected);
+		for ($i = 0, $count = count($items); $i < $count; $i++) {
+			$item = $items[$i];
 			if (str_ends_with($item, '[]')) {
 				if (is_iterable($value) && self::everyIs($value, substr($item, 0, -2))) {
 					return true;
@@ -152,7 +154,16 @@ public static function is(mixed $value, string $expected): bool
 			}
 
 			[$type] = $item = explode(':', $item, 2);
-			if (isset(static::$validators[$type])) {
+			if ($type === 'pattern') {
+				// A pattern may contain pipes, so the rest belongs to it and must not be
+				// split into further validators.
+				$pattern = implode('|', array_merge(array_slice($item, 1), array_slice($items, $i + 1)));
+				if (Strings::match($value, '~^(?:' . $pattern . ')$~D')) {
+					return true;
+				}
+
+				break;
+			} elseif (isset(static::$validators[$type])) {
 				try {
 					if (!static::$validators[$type]($value)) {
 						continue;
@@ -160,12 +171,6 @@ public static function is(mixed $value, string $expected): bool
 				} catch (\TypeError) {
 					continue;
 				}
-			} elseif ($type === 'pattern') {
-				if (Strings::match($value, '|^' . ($item[1] ?? '') . '$|D')) {
-					return true;
-				}
-
-				continue;
 			} elseif (!$value instanceof $type) {
 				continue;
 			}
diff --git a/tests/.coveralls.yml b/tests/.coveralls.yml
deleted file mode 100644
index 845038250..000000000
--- a/tests/.coveralls.yml
+++ /dev/null
@@ -1,4 +0,0 @@
-# for php-coveralls
-service_name: github-actions
-coverage_clover: coverage.xml
-json_path: coverage.json
diff --git a/tests/Utils/Validators.is().phpt b/tests/Utils/Validators.is().phpt
index c15eaf439..012c04246 100644
--- a/tests/Utils/Validators.is().phpt
+++ b/tests/Utils/Validators.is().phpt
@@ -259,6 +259,25 @@ test('validates string against a regular expression pattern', function () {
 });
 
 
+test('allows pipe inside a regular expression pattern', function () {
+	// grouped alternation, https://github.com/nette/utils/issues/206
+	Assert::true(Validators::is('a', 'pattern:(a|b)'));
+	Assert::true(Validators::is('b', 'pattern:(a|b)'));
+	Assert::false(Validators::is('c', 'pattern:(a|b)'));
+
+	// bare alternation must no longer throw and is anchored as a whole
+	Assert::true(Validators::is('a', 'pattern:a|b'));
+	Assert::true(Validators::is('b', 'pattern:a|b'));
+	Assert::false(Validators::is('c', 'pattern:a|b'));
+	Assert::false(Validators::is('ab', 'pattern:a|b'));
+
+	// a pattern combined with other validators
+	Assert::true(Validators::is(5, 'int|pattern:(a|b)'));
+	Assert::true(Validators::is('a', 'int|pattern:(a|b)'));
+	Assert::false(Validators::is('c', 'int|pattern:(a|b)'));
+});
+
+
 test('ensures alphanumeric string meets minimum length', function () {
 	Assert::false(Validators::is('', 'alnum'));
 	Assert::false(Validators::is('a-1', 'alnum'));