字符串解析

 今天做自定义公式,然后要把公式中的变量和运算符找出来.

在这记录下下.

 /// <summary>
        /// 将公式表达式进行解析．
        /// </summary>
        /// <returns></returns>
        public List<string[]> StrAnalyse(string strFormula)
        {

            Regex RegexSplit;//
            MatchCollection mMactchCol;
            var lstStrYsf = new List<string[]>(); //存放每个字符的 值,序号,类型(.+号表示运算符,a表示名称)
            RegexSplit = new Regex(@"\s");
            strFormula = RegexSplit.Replace(strFormula, "");//去除空格

            //筛选出运算符
            RegexSplit = new Regex(@"\W");
            mMactchCol = RegexSplit.Matches(strFormula);
            foreach (Match mMatch in mMactchCol)
            {
                var tempMessage = new string[3];
                tempMessage[0] = mMatch.ToString();
                tempMessage[1] = mMatch.Index.ToString();
                tempMessage[2] = "+";
                lstStrYsf.Add(tempMessage);
            }

            //筛选出名称(字母数字下划线)
            RegexSplit = new Regex(@"\w");
            mMactchCol = RegexSplit.Matches(strFormula);
            foreach (Match mMatch in mMactchCol)
            {
                string[] tempMessage = new string[3];
                tempMessage[0] = mMatch.ToString();
                tempMessage[1] = mMatch.Index.ToString();
                tempMessage[2] = "a";
                lstStrYsf.Add(tempMessage);
            }

            //排序(按原字符串中的顺序排序)
            string[][] strArray = new string[lstStrYsf.Count][];
            for (int i = 0; i < lstStrYsf.Count; i++)
            {
                for (int j = 0; j < lstStrYsf.Count; j++)
                {
                    if (Convert.ToInt16(lstStrYsf[j][1]) == i)
                        strArray[i] = lstStrYsf[j];
                }
            }

            //再次组合成字符串数组,把名称和其余符号分开并标记
            List<string[]> lstResult = new List<string[]>();
            string tap = strArray[0][2];
            string[] strSum = new string[2];
            strSum[1] = tap;
            foreach (string[] s in strArray)
            {

                if (tap == s[2])
                    strSum[0] += s[0];
                else
                {
                    tap = s[2];
                    Array temp = Array.CreateInstance(typeof(string), 2);
                    strSum.CopyTo(temp, 0);
                    lstResult.Add((string[])temp);
                    strSum[0] = s[0];
                    strSum[1] = tap;
                }

            }
            lstResult.Add(strSum);
            
            return lstResult;

        }

看到的朋友有更好的方法或者我的有什么问题,欢迎指点批评.