正则表达式减慢了程序

我正在尝试创建一个程序来解析游戏聊天记录中的数据。 到目前为止，我已经设法让程序工作并解析我想要的数据，但问题是程序变慢了。

目前解析一个10MB的文本文件需要5秒钟，我注意到如果我将RegexOptions.Compiled添加到我的正则表达式，它会下降到3秒。

我相信我已经在我的正则表达式匹配中找到了问题。 由于5个正则表达式，当前读取了一行5次，因此当我稍后添加更多时，程序会变得更慢。

我应该怎么做才能使我的程序不会因多个正则表达式而减速？ 所有使代码更好的建议都值得赞赏！

if (sender.Equals(ButtonParse)) { var totalShots = 0f; var totalHits = 0f; var misses = 0; var crits = 0; var regDmg = new Regex(@"(?<=\bSystem\b.* You inflicted )\d+.\d", RegexOptions.Compiled); var regMiss = new Regex(@"(?<=\bSystem\b.* Target evaded attack)", RegexOptions.Compiled); var regCrit = new Regex(@"(?<=\bSystem\b.* Critical hit - additional damage)", RegexOptions.Compiled); var regHeal = new Regex(@"(?<=\bSystem\b.* You healed yourself )\d+.\d", RegexOptions.Compiled); var regDmgrec = new Regex(@"(?<=\bSystem\b.* You take )\d+.\d", RegexOptions.Compiled); var dmgList = new List(); //New list for damage values var healList = new List(); //New list for heal values var dmgRecList = new List(); //New list for damage received values using (var sr = new StreamReader(TextBox1.Text)) { while (!sr.EndOfStream) { var line = sr.ReadLine(); var match = regDmg.Match(line); var match2 = regMiss.Match(line); var match3 = regCrit.Match(line); var match4 = regHeal.Match(line); var match5 = regDmgrec.Match(line); if (match.Success) { dmgList.Add(float.Parse(match.Value, CultureInfo.InvariantCulture)); totalShots++; totalHits++; } if (match2.Success) { misses++; totalShots++; } if (match3.Success) { crits++; } if (match4.Success) { healList.Add(float.Parse(match4.Value, CultureInfo.InvariantCulture)); } if (match5.Success) { dmgRecList.Add(float.Parse(match5.Value, CultureInfo.InvariantCulture)); } } TextBlockTotalShots.Text = totalShots.ToString(); //Show total shots TextBlockTotalDmg.Text = dmgList.Sum().ToString("0.##"); //Show total damage inflicted TextBlockTotalHits.Text = totalHits.ToString(); //Show total hits var hitChance = totalHits / totalShots; //Calculate hit chance TextBlockHitChance.Text = hitChance.ToString("P"); //Show hit chance TextBlockTotalMiss.Text = misses.ToString(); //Show total misses var missChance = misses / totalShots; //Calculate miss chance TextBlockMissChance.Text = missChance.ToString("P"); //Show miss chance TextBlockTotalCrits.Text = crits.ToString(); //Show total crits var critChance = crits / totalShots; //Calculate crit chance TextBlockCritChance.Text = critChance.ToString("P"); //Show crit chance TextBlockDmgHealed.Text = healList.Sum().ToString("F1"); //Show damage healed TextBlockDmgReceived.Text = dmgRecList.Sum().ToString("F1"); //Show damage received var pedSpent = dmgList.Sum() / (float.Parse(TextBoxEco.Text, CultureInfo.InvariantCulture) * 100); //Calculate ped spent TextBlockPedSpent.Text = pedSpent.ToString("0.##") + " PED"; //Estimated ped spent } } 

这是一个示例文本：

 2014-09-02 23:07:22 [System] [] You inflicted 45.2 points of damage. 2014-09-02 23:07:23 [System] [] You inflicted 45.4 points of damage. 2014-09-02 23:07:24 [System] [] Target evaded attack. 2014-09-02 23:07:25 [System] [] You inflicted 48.4 points of damage. 2014-09-02 23:07:26 [System] [] You inflicted 48.6 points of damage. 2014-10-15 12:39:55 [System] [] Target evaded attack. 2014-10-15 12:39:58 [System] [] You inflicted 56.0 points of damage. 2014-10-15 12:39:59 [System] [] You inflicted 74.6 points of damage. 2014-10-15 12:40:02 [System] [] You inflicted 78.6 points of damage. 2014-10-15 12:40:04 [System] [] Target evaded attack. 2014-10-15 12:40:06 [System] [] You inflicted 66.9 points of damage. 2014-10-15 12:40:08 [System] [] You inflicted 76.2 points of damage. 2014-10-15 12:40:12 [System] [] You take 18.4 points of damage. 2014-10-15 12:40:14 [System] [] You inflicted 76.1 points of damage. 2014-10-15 12:40:17 [System] [] You inflicted 88.5 points of damage. 2014-10-15 12:40:19 [System] [] You inflicted 69.0 points of damage. 2014-10-19 05:56:30 [System] [] Critical hit - additional damage! You inflict 275.4 points of damage. 2014-10-19 05:59:29 [System] [] You inflicted 92.8 points of damage. 2014-10-19 05:59:31 [System] [] Critical hit - additional damage! You inflict 251.5 points of damage. 2014-10-19 05:59:35 [System] [] You take 59.4 points of damage. 2014-10-19 05:59:39 [System] [] You healed yourself 84.0 points. 

Answer 1

以下是我看到的问题

1. 正如评论中所建议的那样，没有正则表达式解析器对基本模式情况的工作方式太多。
2. 为什么要在同一文本上多次解析数据？ 创建一个正则表达式模式，通过每行扫描完成所有工作。
3. 在WPF中，不要让GUI线程继续工作，在后台任务中完成工作并更新viewmodel（你正在使用MVVM吗？），它会使用INotifyPropertyChanged事件将信息传播到屏幕。

以下是一个一行的正则表达式模式解决方案。 它的第一个任务是validation线路上是否包含[System] 。 如果不是，则该行不匹配。 如果它确实有系统，那么它会查找特定的关键字和可能的值，并将它们放入键/值对情境中named match captures正则表达式中。

一旦使用linq完成，它将总结找到的值。 请注意，我已对模式进行了评论，并让正则表达式解析器忽略它。

 string pattern = @"^ # Beginning of line to anchor it. (?=.+\[System\]) # Within the line a literal '[System]' has to occur (?=.+ # Somewhere within that line search for these keywords: (? # Named Match Capture Group 'Action' will hold a keyword. inflicte?d? # if the line has inflict or inflicted put it into 'Action' | # or evaded # evaded | take # or take | yourself # or yourself (heal) ) (\s(?[\d.]+))?) # if a value of points exist place into 'Value' .+ # match one or more to complete it. $ #end of line to stop on"; // IgnorePatternWhiteSpace only allows us to comment the pattern. Does not affect processing. var tokens = Regex.Matches(data, pattern, RegexOptions.IgnorePatternWhitespace | RegexOptions.Multiline) .OfType() .Select( mt => new { Action = mt.Groups["Action"].Value, Value = mt.Groups["Value"].Success ? double.Parse(mt.Groups["Value"].Value) : 0, Count = 1, }) .GroupBy ( itm => itm.Action, // Each action will be grouped into its name for summing itm => itm, // This is value to summed amongst the individual items of the group. (action, values) => new { Action = action, Count = values.Sum (itm => itm.Count), Total = values.Sum(itm => itm.Value) } ); 

结果

linq结果将每个标记作为一个实体返回，该实体总结了操作的所有值，但也计算了这些操作发生的次数。

数据

 string data=@"2014-09-02 23:07:22 [System] [] You inflicted 45.2 points of damage. 2014-09-02 23:07:23 [System] [] You inflicted 45.4 points of damage. 2014-09-02 23:07:24 [System] [] Target evaded attack. 2014-09-02 23:07:25 [System] [] You inflicted 48.4 points of damage. 2014-09-02 23:07:26 [System] [] You inflicted 48.6 points of damage. 2014-10-15 12:39:55 [System] [] Target evaded attack. 2014-10-15 12:39:58 [System] [] You inflicted 56.0 points of damage. 2014-10-15 12:39:59 [System] [] You inflicted 74.6 points of damage. 2014-10-15 12:40:02 [System] [] You inflicted 78.6 points of damage. 2014-10-15 12:40:04 [System] [] Target evaded attack. 2014-10-15 12:40:06 [System] [] You inflicted 66.9 points of damage. 2014-10-15 12:40:08 [System] [] You inflicted 76.2 points of damage. 2014-10-15 12:40:12 [System] [] You take 18.4 points of damage. 2014-10-15 12:40:14 [System] [] You inflicted 76.1 points of damage. 2014-10-15 12:40:17 [System] [] You inflicted 88.5 points of damage. 2014-10-15 12:40:19 [System] [] You inflicted 69.0 points of damage. 2014-10-19 05:56:30 [System] [] Critical hit - additional damage! You inflict 275.4 points of damage. 2014-10-19 05:59:29 [System] [] You inflicted 92.8 points of damage. 2014-10-19 05:59:31 [System] [] Critical hit - additional damage! You inflict 251.5 points of damage. 2014-10-19 05:59:35 [System] [] You take 59.4 points of damage. 2014-10-19 05:59:39 [System] [] You healed yourself 84.0 points.";