diff --git a/tests/queries/0_stateless/01595_countMatches.reference b/tests/queries/0_stateless/01595_countMatches.reference
new file mode 100644
index 00000000000..c65279c0b8e
--- /dev/null
+++ b/tests/queries/0_stateless/01595_countMatches.reference
@@ -0,0 +1,24 @@
+basic
+0
+0
+0
+1
+case sensitive
+2
+1
+2
+2
+2
+2
+4
+4
+case insensitive
+2
+1
+2
+2
+2
+2
+4
+4
+errors
diff --git a/tests/queries/0_stateless/01595_countMatches.sql b/tests/queries/0_stateless/01595_countMatches.sql
new file mode 100644
index 00000000000..6374fe7bc5b
--- /dev/null
+++ b/tests/queries/0_stateless/01595_countMatches.sql
@@ -0,0 +1,29 @@
+select 'basic';
+select countMatches('', 'foo');
+select countMatches('foo', '');
+-- simply stop if zero bytes was processed
+select countMatches('foo', '[f]{0}');
+-- but this is ok
+select countMatches('foo', '[f]{0}foo');
+
+select 'case sensitive';
+select countMatches('foobarfoo', 'foo');
+select countMatches('foobarfoo', 'foo.*');
+select countMatches('oooo', 'oo');
+select countMatches(concat(toString(number), 'foofoo'), 'foo') from numbers(2);
+select countMatches('foobarbazfoobarbaz', 'foo(bar)(?:baz|)');
+select countMatches('foo.com bar.com baz.com bam.com', '([^. ]+)\.([^. ]+)');
+select countMatches('foo.com@foo.com bar.com@foo.com baz.com@foo.com bam.com@foo.com', '([^. ]+)\.([^. ]+)@([^. ]+)\.([^. ]+)');
+
+select 'case insensitive';
+select countMatchesCaseInsensitive('foobarfoo', 'FOo');
+select countMatchesCaseInsensitive('foobarfoo', 'FOo.*');
+select countMatchesCaseInsensitive('oooo', 'Oo');
+select countMatchesCaseInsensitive(concat(toString(number), 'Foofoo'), 'foo') from numbers(2);
+select countMatchesCaseInsensitive('foOBarBAZfoobarbaz', 'foo(bar)(?:baz|)');
+select countMatchesCaseInsensitive('foo.com BAR.COM baz.com bam.com', '([^. ]+)\.([^. ]+)');
+select countMatchesCaseInsensitive('foo.com@foo.com bar.com@foo.com BAZ.com@foo.com bam.com@foo.com', '([^. ]+)\.([^. ]+)@([^. ]+)\.([^. ]+)');
+
+select 'errors';
+select countMatches(1, 'foo') from numbers(1); -- { serverError 43; }
+select countMatches('foobarfoo', toString(number)) from numbers(1); -- { serverError 44; }