diff --git a/工具v2/database_tools.py b/工具v2/database_tools.py
index 1adea771..4e90cf1a 100644
--- a/工具v2/database_tools.py
+++ b/工具v2/database_tools.py
@@ -1912,5 +1912,51 @@ def CheckUsagesValidity(data): #检查使用记录数据是否合理(没有超
             return 1
     return 0
 
+def pairingbraces(string_raw,leftbracepos): #根据字符串中的左括号的位置寻找配对的右括号
+    types = {"(":"()","[":"[]","{":"{}"}
+    braces = "".join([types[i] for i in types])
+    string = string_raw
+    for i in braces:
+        string = string.replace("\\"+i,"  ") #去除LaTeX的括号
+    if not string[leftbracepos] in ("(","[","{"):
+        print("位置上的字符不是左括号")
+        return -1 #位置上不是括号, 返回-1
+    else:
+        braces = types[string[leftbracepos]]
+        lbrace = braces[0]
+        rbrace = braces[1]
+        count = 1
+        currentpos = leftbracepos + 1 
+        while not currentpos == len(string):
+            if string[currentpos] == lbrace:
+                count += 1
+            elif string[currentpos] == rbrace:
+                count -= 1
+            if count == 0:
+                return currentpos # 返回配对的右括号位置
+            currentpos += 1
+        return -1 #未找到配对括号
+
+def InMathEnv(string,pos): #判断string的pos位置上的字符是否在math环境中
+    string = string.repalce("\$","  ")
+    if not string[pos] == "$" and string[:pos].count("$") % 2 == 1:
+        return True
+    else:
+        return False
+    
+
+def MaskingMathEnv(string_raw): #把string_raw中数学环境中的符号都转为$后以新字符串的形式返回
+    string_raw = string_raw.replace(r"\$","  ")
+    countdollars = 0
+    string = ""
+    for i in range(len(string_raw)):
+        if string_raw[i] == "$":
+            countdollars = 1 - countdollars 
+        if countdollars == 0:
+            string += string_raw[i]
+        else:
+            string += "$"
+    return string
+
 if __name__ == "__main__":
     print("数据库工具, import用.")
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