diff --git a/src/unicode.cpp b/src/unicode.cpp
index f7870412a3f4..4a2f58237548 100644
--- a/src/unicode.cpp
+++ b/src/unicode.cpp
@@ -1368,20 +1368,22 @@ std::vector<std::string> unicode_regex_split(const std::string & text, const std
                 //printf("regex_expr_collapsed: %s\n", regex_expr_collapsed.c_str());
                 bpe_offsets = unicode_regex_split_stl(text_collapsed, regex_expr_collapsed, bpe_offsets);
             } else {
-                // no unicode category used, we can use std::wregex directly
-                std::wstring wregex_expr(cpts_regex.begin(), cpts_regex.end());
-
-                // std::wregex \s does not mach non-ASCII whitespaces, using 0x0B as fallback
-                std::wstring wtext(cpts.begin(), cpts.end());
-                for (size_t i = 0; i < wtext.size(); ++i) {
-                    if (wtext[i] > 0x7F && unicode_cpt_flags_from_cpt(wtext[i]).is_whitespace) {
-                        wtext[i] = 0x0B;
-                    }
-                }
-
-                //printf("text: %s\n", text.c_str());
-                //printf("regex_expr: %s\n", regex_expr.c_str());
-                bpe_offsets = unicode_regex_split_stl(wtext, wregex_expr, bpe_offsets);
+                fprintf(stderr, "Only use utf-8");
+                std::abort();
+                // // no unicode category used, we can use std::wregex directly
+                // std::wstring wregex_expr(cpts_regex.begin(), cpts_regex.end());
+
+                // // std::wregex \s does not mach non-ASCII whitespaces, using 0x0B as fallback
+                // std::wstring wtext(cpts.begin(), cpts.end());
+                // for (size_t i = 0; i < wtext.size(); ++i) {
+                //     if (wtext[i] > 0x7F && unicode_cpt_flags_from_cpt(wtext[i]).is_whitespace) {
+                //         wtext[i] = 0x0B;
+                //     }
+                // }
+
+                // //printf("text: %s\n", text.c_str());
+                // //printf("regex_expr: %s\n", regex_expr.c_str());
+                // bpe_offsets = unicode_regex_split_stl(wtext, wregex_expr, bpe_offsets);
             }
         } catch (std::regex_error & e) {
             fprintf(stderr, "Failed to process regex: '%s'\n", regex_expr.c_str());