diff --git a/dbms/include/DB/Functions/FunctionsStringSearch.h b/dbms/include/DB/Functions/FunctionsStringSearch.h
index 3f3cbe17d8d..4da88809724 100644
--- a/dbms/include/DB/Functions/FunctionsStringSearch.h
+++ b/dbms/include/DB/Functions/FunctionsStringSearch.h
@@ -75,7 +75,7 @@ struct PositionImpl
 		while (pos < end && end != (pos = searcher.search(pos, end - pos)))
 		{
 			/// Определим, к какому индексу оно относится.
-			while (begin + offsets[i] < pos)
+			while (begin + offsets[i] <= pos)
 			{
 				res[i] = 0;
 				++i;
@@ -163,7 +163,7 @@ struct PositionUTF8Impl
 		while (pos < end && end != (pos = searcher.search(pos, end - pos)))
 		{
 			/// Определим, к какому индексу оно относится.
-			while (begin + offsets[i] < pos)
+			while (begin + offsets[i] <= pos)
 			{
 				res[i] = 0;
 				++i;
@@ -364,7 +364,7 @@ public:
 		while (pos < end && end != (pos = searcher.find(pos, end)))
 		{
 			/// Определим, к какому индексу оно относится.
-			while (begin + offsets[i] < pos)
+			while (begin + offsets[i] <= pos)
 			{
 				res[i] = 0;
 				++i;
@@ -627,7 +627,7 @@ public:
 		while (pos < end && end != (pos = searcher.find(pos, end)))
 		{
 			/// Определим, к какому индексу оно относится.
-			while (begin + offsets[i] < pos)
+			while (begin + offsets[i] <= pos)
 			{
 				res[i] = 0;
 				++i;
@@ -898,7 +898,7 @@ struct MatchImpl
 			while (pos < end && end != (pos = searcher.search(pos, end - pos)))
 			{
 				/// Определим, к какому индексу оно относится.
-				while (begin + offsets[i] < pos)
+				while (begin + offsets[i] <= pos)
 				{
 					res[i] = revert;
 					++i;
@@ -965,7 +965,7 @@ struct MatchImpl
 				while (pos < end && end != (pos = searcher.search(pos, end - pos)))
 				{
 					/// Определим, к какому индексу оно относится.
-					while (begin + offsets[i] < pos)
+					while (begin + offsets[i] <= pos)
 					{
 						res[i] = revert;
 						++i;
@@ -1361,7 +1361,7 @@ struct ReplaceStringImpl
 			memcpy(&res_data[res_offset], pos, match - pos);
 
 			/// Определим, к какому индексу оно относится.
-			while (i < offsets.size() && begin + offsets[i] < match)
+			while (i < offsets.size() && begin + offsets[i] <= match)
 			{
 				res_offsets[i] = res_offset + ((begin + offsets[i]) - pos);
 				++i;
@@ -1398,6 +1398,7 @@ struct ReplaceStringImpl
 				res_offset += (begin + offsets[i] - pos);
 				res_offsets[i] = res_offset;
 				pos = begin + offsets[i];
+				++i;
 			}
 		}
 	}
@@ -1430,7 +1431,7 @@ struct ReplaceStringImpl
 			memcpy(&res_data[res_offset], pos, match - pos);
 
 			/// Определим, к какому индексу оно относится.
-			while (i < size && begin + n * (i + 1) < match)
+			while (i < size && begin + n * (i + 1) <= match)
 			{
 				res_offsets[i] = res_offset + ((begin + n * (i + 1)) - pos);
 				++i;
diff --git a/dbms/include/DB/Functions/FunctionsVisitParam.h b/dbms/include/DB/Functions/FunctionsVisitParam.h
index 90282d3e734..7770664a69c 100644
--- a/dbms/include/DB/Functions/FunctionsVisitParam.h
+++ b/dbms/include/DB/Functions/FunctionsVisitParam.h
@@ -306,7 +306,7 @@ struct ExtractParamImpl
 		while (pos < end && end != (pos = searcher.search(pos, end - pos)))
 		{
 			/// Определим, к какому индексу оно относится.
-			while (begin + offsets[i] < pos)
+			while (begin + offsets[i] <= pos)
 			{
 				res[i] = 0;
 				++i;
@@ -369,7 +369,7 @@ struct ExtractParamToStringImpl
 		while (pos < end && end != (pos = searcher.search(pos, end - pos)))
 		{
 			/// Определим, к какому индексу оно относится.
-			while (begin + offsets[i] < pos)
+			while (begin + offsets[i] <= pos)
 			{
 				res_data.push_back(0);
 				res_offsets[i] = res_data.size();
diff --git a/dbms/tests/queries/0_stateless/00240_replace_substring_loop.reference b/dbms/tests/queries/0_stateless/00240_replace_substring_loop.reference
new file mode 100644
index 00000000000..390ec161dc2
--- /dev/null
+++ b/dbms/tests/queries/0_stateless/00240_replace_substring_loop.reference
@@ -0,0 +1,192 @@
+.	.	.	1
+.	.	.	1
+.	.	.	1
+._	.o	.o	1
+.	.	.	1
+_.	o.	o.	1
+.	.	.	1
+_._	o.o	o.o	1
+._	.o	.o	1
+.	.	.	1
+._	.o	.o	1
+._	.o	.o	1
+._	.o	.o	1
+_.	o.	o.	1
+._	.o	.o	1
+_._	o.o	o.o	1
+_.	o.	o.	1
+.	.	.	1
+_.	o.	o.	1
+._	.o	.o	1
+_.	o.	o.	1
+_.	o.	o.	1
+_.	o.	o.	1
+_._	o.o	o.o	1
+_._	o.o	o.o	1
+.	.	.	1
+_._	o.o	o.o	1
+._	.o	.o	1
+_._	o.o	o.o	1
+_.	o.	o.	1
+_._	o.o	o.o	1
+_._	o.o	o.o	1
+.	.	.	1
+.	.	.	1
+.	.	.	1
+._	.oo	.oo	1
+.	.	.	1
+_.	oo.	oo.	1
+.	.	.	1
+_._	oo.oo	oo.oo	1
+._	.oo	.oo	1
+.	.	.	1
+._	.oo	.oo	1
+._	.oo	.oo	1
+._	.oo	.oo	1
+_.	oo.	oo.	1
+._	.oo	.oo	1
+_._	oo.oo	oo.oo	1
+_.	oo.	oo.	1
+.	.	.	1
+_.	oo.	oo.	1
+._	.oo	.oo	1
+_.	oo.	oo.	1
+_.	oo.	oo.	1
+_.	oo.	oo.	1
+_._	oo.oo	oo.oo	1
+_._	oo.oo	oo.oo	1
+.	.	.	1
+_._	oo.oo	oo.oo	1
+._	.oo	.oo	1
+_._	oo.oo	oo.oo	1
+_.	oo.	oo.	1
+_._	oo.oo	oo.oo	1
+_._	oo.oo	oo.oo	1
+.	.	.	1
+.	.	.	1
+.	.	.	1
+.__	.oo	.oo	1
+.	.	.	1
+__.	oo.	oo.	1
+.	.	.	1
+__.__	oo.oo	oo.oo	1
+.__	.oo	.oo	1
+.	.	.	1
+.__	.oo	.oo	1
+.__	.oo	.oo	1
+.__	.oo	.oo	1
+__.	oo.	oo.	1
+.__	.oo	.oo	1
+__.__	oo.oo	oo.oo	1
+__.	oo.	oo.	1
+.	.	.	1
+__.	oo.	oo.	1
+.__	.oo	.oo	1
+__.	oo.	oo.	1
+__.	oo.	oo.	1
+__.	oo.	oo.	1
+__.__	oo.oo	oo.oo	1
+__.__	oo.oo	oo.oo	1
+.	.	.	1
+__.__	oo.oo	oo.oo	1
+.__	.oo	.oo	1
+__.__	oo.oo	oo.oo	1
+__.	oo.	oo.	1
+__.__	oo.oo	oo.oo	1
+__.__	oo.oo	oo.oo	1
+.	.	.	1
+.	.	.	1
+.	.	.	1
+._	.o	.o	1
+.	.	.	1
+_.	o.	o.	1
+.	.	.	1
+_._	o._	o._	1
+._	.o	.o	1
+.	.	.	1
+._	.o	.o	1
+._	.o	.o	1
+._	.o	.o	1
+_.	o.	o.	1
+._	.o	.o	1
+_._	o._	o._	1
+_.	o.	o.	1
+.	.	.	1
+_.	o.	o.	1
+._	.o	.o	1
+_.	o.	o.	1
+_.	o.	o.	1
+_.	o.	o.	1
+_._	o._	o._	1
+_._	o._	o._	1
+.	.	.	1
+_._	o._	o._	1
+._	.o	.o	1
+_._	o._	o._	1
+_.	o.	o.	1
+_._	o._	o._	1
+_._	o._	o._	1
+.	.	.	1
+.	.	.	1
+.	.	.	1
+._	.oo	.oo	1
+.	.	.	1
+_.	oo.	oo.	1
+.	.	.	1
+_._	oo._	oo._	1
+._	.oo	.oo	1
+.	.	.	1
+._	.oo	.oo	1
+._	.oo	.oo	1
+._	.oo	.oo	1
+_.	oo.	oo.	1
+._	.oo	.oo	1
+_._	oo._	oo._	1
+_.	oo.	oo.	1
+.	.	.	1
+_.	oo.	oo.	1
+._	.oo	.oo	1
+_.	oo.	oo.	1
+_.	oo.	oo.	1
+_.	oo.	oo.	1
+_._	oo._	oo._	1
+_._	oo._	oo._	1
+.	.	.	1
+_._	oo._	oo._	1
+._	.oo	.oo	1
+_._	oo._	oo._	1
+_.	oo.	oo.	1
+_._	oo._	oo._	1
+_._	oo._	oo._	1
+.	.	.	1
+.	.	.	1
+.	.	.	1
+.__	.o_	.o_	1
+.	.	.	1
+__.	o_.	o_.	1
+.	.	.	1
+__.__	o_.__	o_.__	1
+.__	.o_	.o_	1
+.	.	.	1
+.__	.o_	.o_	1
+.__	.o_	.o_	1
+.__	.o_	.o_	1
+__.	o_.	o_.	1
+.__	.o_	.o_	1
+__.__	o_.__	o_.__	1
+__.	o_.	o_.	1
+.	.	.	1
+__.	o_.	o_.	1
+.__	.o_	.o_	1
+__.	o_.	o_.	1
+__.	o_.	o_.	1
+__.	o_.	o_.	1
+__.__	o_.__	o_.__	1
+__.__	o_.__	o_.__	1
+.	.	.	1
+__.__	o_.__	o_.__	1
+.__	.o_	.o_	1
+__.__	o_.__	o_.__	1
+__.	o_.	o_.	1
+__.__	o_.__	o_.__	1
+__.__	o_.__	o_.__	1
diff --git a/dbms/tests/queries/0_stateless/00240_replace_substring_loop.sql b/dbms/tests/queries/0_stateless/00240_replace_substring_loop.sql
new file mode 100644
index 00000000000..2c9157d5946
--- /dev/null
+++ b/dbms/tests/queries/0_stateless/00240_replace_substring_loop.sql
@@ -0,0 +1,101 @@
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '._']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '_.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '_._']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['._', '.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['._', '._']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['._', '_.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['._', '_._']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_.', '.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_.', '._']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_.', '_.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_.', '_._']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_._', '.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_._', '._']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_._', '_.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_._', '_._']) AS s);
+
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['.', '.']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['.', '._']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['.', '_.']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['.', '_._']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['._', '.']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['._', '._']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['._', '_.']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['._', '_._']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_.', '.']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_.', '._']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_.', '_.']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_.', '_._']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_._', '.']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_._', '._']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_._', '_.']) AS s);
+SELECT s, replaceAll(s, '_', 'oo') AS a, replaceRegexpAll(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_._', '_._']) AS s);
+
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '.__']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '__.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '__.__']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.__', '.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.__', '.__']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.__', '__.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.__', '__.__']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.', '.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.', '.__']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.', '__.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.', '__.__']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.__', '.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.__', '.__']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.__', '__.']) AS s);
+SELECT s, replaceAll(s, '_', 'o') AS a, replaceRegexpAll(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.__', '__.__']) AS s);
+
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '._']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '_.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '_._']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['._', '.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['._', '._']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['._', '_.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['._', '_._']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_.', '.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_.', '._']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_.', '_.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_.', '_._']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_._', '.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_._', '._']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_._', '_.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['_._', '_._']) AS s);
+
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['.', '.']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['.', '._']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['.', '_.']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['.', '_._']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['._', '.']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['._', '._']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['._', '_.']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['._', '_._']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_.', '.']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_.', '._']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_.', '_.']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_.', '_._']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_._', '.']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_._', '._']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_._', '_.']) AS s);
+SELECT s, replaceOne(s, '_', 'oo') AS a, replaceRegexpOne(s, '_', 'oo') AS b, a = b FROM (SELECT arrayJoin(['_._', '_._']) AS s);
+
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '.__']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '__.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.', '__.__']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.__', '.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.__', '.__']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.__', '__.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['.__', '__.__']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.', '.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.', '.__']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.', '__.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.', '__.__']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.__', '.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.__', '.__']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.__', '__.']) AS s);
+SELECT s, replaceOne(s, '_', 'o') AS a, replaceRegexpOne(s, '_', 'o') AS b, a = b FROM (SELECT arrayJoin(['__.__', '__.__']) AS s);