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参考博主：unity 提取字符串数字修改后返回字符串_unity string提取数字_lvcoc的博客-CSDN博客

 正数和浮点数的 正则表达式

//正则表达式//const string pattern = @"\d+";//表达1位或多位的整数数字  const string pattern = @"\d+\.\d+";//表达1位或多位的浮点数字  /// <summary>/// /// </summary>/// <param name="atr01"></param>/// <returns></returns>private string ChangeString(string atr01){string atr = atr01;var a = Regex.Matches(atr, pattern).Cast<Match>().Select(m => m.Index).ToArray();var b = Regex.Matches(atr, pattern).Cast<Match>().Select(m => m.Value).ToArray();string[] tmp = Regex.Matches(atr, pattern).Cast<Match>().Select(m => m.Value).ToArray();for (int y = 0; y < b.Length; y++){tmp[y] = double.Parse( tmp[y]).ToString("f3");}for (int z = a.Length - 1; z >= 0; z--){var length = b[z].Length;string t1 = atr.Substring(0, a[z]);string t2 = atr.Substring(a[z] + length, atr.Length - a[z] - length);atr = string.Format("{0}{1}{2}", t1, tmp[z], t2);}return atr;}

示例：

void Awake(){
ChangeString("z = 0.08596656649430752LAI  +  0.032354611497339036Aspect  +  0.07883658697039622Humidity  +  58.427987942231184");}//正则表达式//const string pattern = @"\d+";//表达1位或多位的整数数字  const string pattern = @"\d+\.\d+";//表达1位或多位的浮点数字  /// <summary>/// /// </summary>/// <param name="atr01"></param>/// <returns></returns>private string ChangeString(string atr01){string atr = atr01;var a = Regex.Matches(atr, pattern).Cast<Match>().Select(m => m.Index).ToArray();var b = Regex.Matches(atr, pattern).Cast<Match>().Select(m => m.Value).ToArray();string[] tmp = Regex.Matches(atr, pattern).Cast<Match>().Select(m => m.Value).ToArray();for (int y = 0; y < b.Length; y++){tmp[y] = double.Parse( tmp[y]).ToString("f3");}for (int z = a.Length - 1; z >= 0; z--){var length = b[z].Length;string t1 = atr.Substring(0, a[z]);string t2 = atr.Substring(a[z] + length, atr.Length - a[z] - length);atr = string.Format("{0}{1}{2}", t1, tmp[z], t2);}return atr;}

用例：“z = 0.08596656649430752LAI  +  0.032354611497339036Aspect  +  0.07883658697039622Humidity  +  58.427987942231184”

打印结果：z = 0.085LAI  +  0.032Aspect  +  0.078Humidity  +  58.427