[fix](regex) String with Chinese characters matching failed (#20493)

be/src/vec/functions/like.cpp

@@ -437,8 +437,9 @@ Status FunctionLikeBase::regexp_fn_predicate(LikeSearchState* state,
 Status FunctionLikeBase::hs_prepare(FunctionContext* context, const char* expression,
                                     hs_database_t** database, hs_scratch_t** scratch) {
     hs_compile_error_t* compile_err;
-    auto res = hs_compile(expression, HS_FLAG_DOTALL | HS_FLAG_ALLOWEMPTY, HS_MODE_BLOCK, nullptr,
-                          database, &compile_err);
+    auto res = hs_compile(expression, HS_FLAG_DOTALL | HS_FLAG_ALLOWEMPTY | HS_FLAG_UTF8,
+                          HS_MODE_BLOCK, nullptr, database, &compile_err);
+
     if (res != HS_SUCCESS) {
         *database = nullptr;
         if (context) {

regression-test/data/query_p0/sql_functions/string_functions/test_string_function_regexp.out

@@ -73,6 +73,12 @@ a-b c
 -- !sql --
 a <b> b
 
+-- !sql_utf1 --
+true
+
+-- !sql_utf2 --
+true
+
 -- !sql_regexp_null --
 \N
 \N

regression-test/suites/query_p0/sql_functions/string_functions/test_string_function_regexp.groovy

@@ -63,6 +63,9 @@ suite("test_string_function_regexp") {
     qt_sql "SELECT regexp_replace_one('a b c', \" \", \"-\");"
     qt_sql "SELECT regexp_replace_one('a b b','(b)','<\\\\1>');"
 
+    qt_sql_utf1 """ select '皖12345' REGEXP '^[皖][0-9]{5}\$'; """
+    qt_sql_utf2 """ select '皖 12345' REGEXP '^[皖] [0-9]{5}\$'; """
+
     // bug fix
     sql """
         INSERT INTO ${tbName} VALUES