more regex special char escaping

nvim/lua/plugins/nvim-cmp.lua

@@ -51,7 +51,7 @@ return {
               return { '<file_sep>', '<|end_of_text|>', '<|endoftext|>' }
             elseif model:match '^codestral' then
               return { '[INST]', '[/INST]', '[PREFIX]', '[MIDDLE]', '[SUFFIX]' }
-            elseif model:match '^deepseek-coder' then
+            elseif model:match '^deepseek%-coder' then
               return nil
             end
           end