diff --git a/lua/number_translator.lua b/lua/number_translator.lua
index 4253117..710dee9 100644
--- a/lua/number_translator.lua
+++ b/lua/number_translator.lua
@@ -110,9 +110,11 @@ local function number_translatorFunc(num)
 end
 
 -- 触发模式为任意大写字母（除了 U，U 用在 Unicode 了）开头，可在 recognizer/patterns 中自定义
-local function number_translator(input, seg)
+local function number_translator(input, seg, env)
+	-- 获取 recognizer/patterns/number 的第 2 个字符作为触发前缀
+	env.number_keyword = env.number_keyword or env.engine.schema.config:get_string('recognizer/patterns/rmb'):sub(2, 2)
     local str, num, numberPart
-    if string.match(input, "^([A-TV-Z]+%d+)(%.?)(%d*)$") ~= nil then
+    if env.number_keyword ~= '' and input:sub(1, 1) == env.number_keyword then
         str = string.gsub(input, "^(%a+)", "")
         numberPart = number_translatorFunc(str)
         if #numberPart > 0 then
diff --git a/lua/select_character.lua b/lua/select_character.lua
new file mode 100644
index 0000000..1fdaa03
--- /dev/null
+++ b/lua/select_character.lua
@@ -0,0 +1,79 @@
+-- 依次定字
+-- 来源：
+-- https://github.com/BlindingDark/rime-lua-select-character/blob/master/lua/select_character.lua
+-- http://lua-users.org/lists/lua-l/2014-04/msg00590.html
+local function utf8_sub(s, i, j)
+   i = i or 1
+   j = j or -1
+
+   if i < 1 or j < 1 then
+      local n = utf8.len(s)
+      if not n then return nil end
+      if i < 0 then i = n + 1 + i end
+      if j < 0 then j = n + 1 + j end
+      if i < 0 then i = 1 elseif i > n then i = n end
+      if j < 0 then j = 1 elseif j > n then j = n end
+   end
+
+   if j < i then return "" end
+
+   i = utf8.offset(s, i)
+   j = utf8.offset(s, j + 1)
+
+   if i and j then
+      return s:sub(i, j - 1)
+   elseif i then
+      return s:sub(i)
+   else
+      return ""
+   end
+end
+
+local function first_character(s)
+   return utf8_sub(s, 1, 1)
+end
+
+local function last_character(s)
+   return utf8_sub(s, -1, -1)
+end
+
+local function get_commit_text(context, fun)
+   local candidate_text = context:get_selected_candidate().text
+   local selected_character = fun(candidate_text)
+
+   context:clear_previous_segment()
+   local commit_text = context:get_commit_text()
+
+   context:clear()
+
+   return commit_text .. selected_character
+end
+
+local function select_character(key, env)
+   local engine = env.engine
+   local context = engine.context
+   local config = engine.schema.config
+
+   -- 选择开头字
+   local first_key = config:get_string('key_binder/select_first_character') or 'bracketleft'
+   -- 选择末尾字
+   local last_key = config:get_string('key_binder/select_last_character') or 'bracketright'
+
+   local commit_text = context:get_commit_text()
+
+   if (key:repr() == first_key and commit_text ~= "") then
+      engine:commit_text(get_commit_text(context, first_character))
+
+      return 1 -- kAccepted
+   end
+
+   if (key:repr() == last_key and commit_text ~= "") then
+      engine:commit_text(get_commit_text(context, last_character))
+
+      return 1 -- kAccepted
+   end
+
+   return 2 -- kNoop
+end
+
+return select_character
\ No newline at end of file
diff --git a/rime.lua b/rime.lua
index a665bcd..3181595 100755
--- a/rime.lua
+++ b/rime.lua
@@ -9,3 +9,5 @@ reduce_english_filter = require("reduce_english_filter")
 corrector = require("corrector")
 -- 中国农历
 Chinese_lunar_calendar = require("chineseLunarCalendar")
+-- 以词定字（默认为「[」和「]」；在 key_binder 下配置快捷键
+select_character = require("select_character")
\ No newline at end of file
diff --git a/rime_mint.schema.yaml b/rime_mint.schema.yaml
index 67f4354..832e136 100755
--- a/rime_mint.schema.yaml
+++ b/rime_mint.schema.yaml
@@ -48,6 +48,7 @@ switches:
 
 engine:
   processors:
+    - lua_processor@select_character      # 以词定字
     - ascii_composer # ※ 處理西文模式及中西文切換
     - recognizer # ※ 與 matcher 搭配，處理符合特定規則的輸入碼，如網址、反查等
     - key_binder # ※ 在特定條件下將按鍵綁定到其他按鍵，如重定義逗號、句號爲候選翻頁鍵
@@ -290,5 +291,5 @@ recognizer:
     wubi98_mint: "uw[a-z]*'?$"
     stroke: "ui[a-z]*'?$"
     chaizi: "uu[a-z]*'?$"
-    number: "^R[0-9]+[.]?[0-9]*"        # 响应 lua_translator@number_translator 脚本将自动获取第 2 个字符作为触发前缀
+    rmb: "^R[0-9]+[.]?[0-9]*"        # 响应 lua_translator@number_translator 脚本将自动获取第 2 个字符作为触发前缀
     gregorian_to_lunar: "^N[0-9]{1,8}"  # 响应 lua_translator@Chinese_lunar_calendar 公历转农历，输入 N20240115 得到「二〇二四年腊月初五」，脚本将自动获取第 2 个字符作为触发前缀