Added another test

tests/queries/0_stateless/01273_extractGroups.reference

+0 groups, zero matches
+[]
+1 group, multiple matches, String and FixedString
+['hello','world']
+['hello','world']
+['hello','world']
+['hello','world']
+['hello','world']
+['hello','world']
+multiple matches
+['abc','111']
+big match
+0	0	[]
+260	1	[156]
+520	1	[156]
+lots of matches
+0	0	0
+260	1	1
+520	1	1
+lots of groups
+0	0	[]
+260	100	[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
+520	100	[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]

tests/queries/0_stateless/01273_extractGroups.sql

+-- error cases
+SELECT extractGroups();  --{serverError 42} not enough arguments
+SELECT extractGroups('hello');  --{serverError 42} not enough arguments
+SELECT extractGroups('hello', 123);  --{serverError 43} invalid argument type
+SELECT extractGroups(123, 'world');  --{serverError 43}  invalid argument type
+SELECT extractGroups('hello world', '((('); --{serverError 427}  invalid re
+SELECT extractGroups('hello world', materialize('\\w+')); --{serverError 44} non-cons needle
+
+SELECT '0 groups, zero matches';
+SELECT extractGroups('hello world', '\\w+');
+
+SELECT '1 group, multiple matches, String and FixedString';
+SELECT extractGroups('hello world', '(\\w+) (\\w+)');
+SELECT extractGroups('hello world', CAST('(\\w+) (\\w+)' as FixedString(11)));
+SELECT extractGroups(CAST('hello world' AS FixedString(12)), '(\\w+) (\\w+)');
+SELECT extractGroups(CAST('hello world' AS FixedString(12)), CAST('(\\w+) (\\w+)' as FixedString(11)));
+SELECT extractGroups(materialize(CAST('hello world' AS FixedString(12))), '(\\w+) (\\w+)');
+SELECT extractGroups(materialize(CAST('hello world' AS FixedString(12))), CAST('(\\w+) (\\w+)' as FixedString(11)));
+
+SELECT 'multiple matches';
+SELECT extractGroups('abc=111, def=222, ghi=333 "jkl mno"="444 foo bar"', '("[^"]+"|\\w+)=("[^"]+"|\\w+)');
+
+SELECT 'big match';
+SELECT
+    length(haystack), length(matches), arrayMap((x) -> length(x), matches)
+FROM (
+    SELECT
+        repeat('abcdefghijklmnopqrstuvwxyz', number * 10) AS haystack,
+        extractGroups(haystack, '(abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz)') AS matches
+    FROM numbers(3)
+);
+
+SELECT 'lots of matches';
+SELECT
+    length(haystack), length(matches), arrayReduce('sum', arrayMap((x) -> length(x), matches))
+FROM (
+    SELECT
+        repeat('abcdefghijklmnopqrstuvwxyz', number * 10) AS haystack,
+        extractGroups(haystack, '(\\w)') AS matches
+    FROM numbers(3)
+);
+
+SELECT 'lots of groups';
+SELECT
+    length(haystack), length(matches), arrayMap((x) -> length(x), matches)
+FROM (
+    SELECT
+        repeat('abcdefghijklmnopqrstuvwxyz', number * 10) AS haystack,
+        extractGroups(haystack, repeat('(\\w)', 100)) AS matches
+    FROM numbers(3)
+);