.NET正则表达式引擎没有返回匹配但是我期待8
我试图写出一个正则表达式来从SQL脚本获取每个插入行。 当我在Regex Hero上使用.NET Regex Tester时， 我得到了我预期的8场比赛 。 但是，当我将此snippit作为控制台应用程序运行时，它不返回任何匹配项。
const string text = @"INSERT INTO [AdminPrefs] ( [SpayClinic] , [VaxClinic] , [ShelterClinic] , [DateModified] , [Prefix] , [UpdateCounter] , [LockedRecs] , [dbName] , [Timer] , [MedCtrClinic] , [OtherClinic] , [Da2PPPx] , [Da2PPEPx] , [FVRCPPx] , [FVRCPEPx] , [FELVTPx] , [FELVTEPx] , [FELVVPx] , [FELVVEPx] , [HWTPx] , [HWTEPx] , [RabiesPx] , [RabiesEPx] , [FIVTest] , [FIVTestE] , [OnePlusChar] , [XSHWMPx] , [XSHWMEPx] , [SHWMPx] , [SHWMEPx] , [MHWMPx] , [MHWMEPx] , [LHWMPx] , [LHWMEPx] , [DebuggerOn] , [PayThisAmount] , [free6] , [XSHWMPillPx] , [XSHWMPillEPx] , [SHWMPillPx] , [SHWMPillEPx] , [MHWMPillPx] , [MHWMPillEPx] , [LHWMPillPx] , [LHWMPillEPx] , [free7] , [free8] , [free9] , [XSPMPx] , [XSPMEPx] , [SPMPx] , [SPMEPx] , [MPMPx] , [MPMEPx] , [LPMPx] , [LPMEPx] , [ReceiptFooter] , [MonthsUntilBenefits] , [free12] , [XSPMPillPx] , [XSPMPillEPx] , [SPMPillPx] , [SPMPillEPx] , [MPMPillPx] , [MPMPillEPx] , [LPMPillPx] , [LPMPillEPx] , [free14] , [ClinicName] , [ShelterName] , [ShelterAbbr] , [Address1] , [Address2] , [City] , [State] , [ZipCode] , [MainPhone] , [MainFax] , [SplashPict] , [free17] , [free18] , [LicenseNo] , [SerialNo] , [free20] , [free21] , [free22] , [VLogCC] , [SNLogCC] , [free23] , [free24] , [free25] , [AgeAndBDay] , [free26] , [free27] , [free28] , [CurrRouteNum] ) VALUES (12 , 7 , 0 , '0000/00/00 00:00:00:00' , '' , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , '' , '' , '' , '' , '' , '' , '' , '' , '' , X'5443503408' , 0 , 0 , '' , 0 , 0 , 0 , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0), (15 , 53 , 0 , '0000/00/00 00:00:00:00' , '' , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , '' , '' , '' , '' , '' , '' , '' , '' , '' , X'5443503408' , 0 , 0 , '' , 0 , 0 , 0 , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0), (20 , 216 , 0 , '0000/00/00 00:00:00:00' , '' , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , '' , '' , '' , '' , '' , '' , '' , '' , '' , X'5443503408' , 0 , 0 , '' , 0 , 0 , 0 , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0), (16 , 8 , 0 , '0000/00/00 00:00:00:00' , '' , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , '' , '' , '' , '' , '' , '' , '' , '' , '' , X'5443503408' , 0 , 0 , '' , 0 , 0 , 0 , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0); INSERT INTO [AdminPrefs] ( [SpayClinic] , [VaxClinic] , [ShelterClinic] , [DateModified] , [Prefix] , [UpdateCounter] , [LockedRecs] , [dbName] , [Timer] , [MedCtrClinic] , [OtherClinic] , [Da2PPPx] , [Da2PPEPx] , [FVRCPPx] , [FVRCPEPx] , [FELVTPx] , [FELVTEPx] , [FELVVPx] , [FELVVEPx] , [HWTPx] , [HWTEPx] , [RabiesPx] , [RabiesEPx] , [FIVTest] , [FIVTestE] , [OnePlusChar] , [XSHWMPx] , [XSHWMEPx] , [SHWMPx] , [SHWMEPx] , [MHWMPx] , [MHWMEPx] , [LHWMPx] , [LHWMEPx] , [DebuggerOn] , [PayThisAmount] , [free6] , [XSHWMPillPx] , [XSHWMPillEPx] , [SHWMPillPx] , [SHWMPillEPx] , [MHWMPillPx] , [MHWMPillEPx] , [LHWMPillPx] , [LHWMPillEPx] , [free7] , [free8] , [free9] , [XSPMPx] , [XSPMEPx] , [SPMPx] , [SPMEPx] , [MPMPx] , [MPMEPx] , [LPMPx] , [LPMEPx] , [ReceiptFooter] , [MonthsUntilBenefits] , [free12] , [XSPMPillPx] , [XSPMPillEPx] , [SPMPillPx] , [SPMPillEPx] , [MPMPillPx] , [MPMPillEPx] , [LPMPillPx] , [LPMPillEPx] , [free14] , [ClinicName] , [ShelterName] , [ShelterAbbr] , [Address1] , [Address2] , [City] , [State] , [ZipCode] , [MainPhone] , [MainFax] , [SplashPict] , [free17] , [free18] , [LicenseNo] , [SerialNo] , [free20] , [free21] , [free22] , [VLogCC] , [SNLogCC] , [free23] , [free24] , [free25] , [AgeAndBDay] , [free26] , [free27] , [free28] , [CurrRouteNum] ) VALUES (26 , 5 , 0 , '0000/00/00 00:00:00:00' , '' , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , '' , '' , '' , '' , '' , '' , '' , '' , '' , X'5443503408' , 0 , 0 , '' , 0 , 0 , 0 , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0), (18 , 12 , 0 , '0000/00/00 00:00:00:00' , '' , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , '' , '' , '' , '' , '' , '' , '' , '' , '' , X'5443503408' , 0 , 0 , '' , 0 , 0 , 0 , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0), (9 , 10 , 0 , '0000/00/00 00:00:00:00' , '' , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , '' , '' , '' , '' , '' , '' , '' , '' , '' , X'5443503408' , 0 , 0 , '' , 0 , 0 , 0 , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0), (2 , 72 , 0 , '0000/00/00 00:00:00:00' , '' , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , '' , '' , '' , '' , '' , '' , '' , '' , '' , '' , X'5443503408' , 0 , 0 , '' , 0 , 0 , 0 , 0 , '' , '' , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0); "; static void Main(string[] args) { string query = @"^\(.*?\)(,|;)$"; var matches = Regex.Matches(text, query, RegexOptions.Singleline | RegexOptions.Multiline); Console.WriteLine("Expected Matches: 8"); Console.WriteLine("Matches Found: {0}", matches.Count); Console.ReadLine(); } 对于网站和我的代码（Multiline和Singleline），我的选择完全相同，他们应该使用相同的.NET正则表达式引擎，那么是什么导致两者之间的差异？
最终结果：
对于所有那些好奇我的最终正则表达式
@"(?<=^\() # The beginning of a line followed by a ( ((('(?.*?)'(?!')(?=[\s\)])) | # Text string in SQL supports line breaks (?-?[\d\.]+) | # Any numbers (X'(?[0-9a-f]*)') # Something formatted like X'0123456789abcdef' )(\s,\s)? # Spaces and commas between the records )+ # Repeat the pattern at least one time (?=(?<!'')\)[;,]\r?$) # The End of the line ending with ); or ), and not immediately proceeded by ''";
所有计划将其用于研发（rip-off和deploy）开发的人都要注意这只适用于我的SQL，因为它非常规律。 如果与我的第三方程序不生成的SQL一起使用，则需要调整以处理许多我不需要处理的边缘情况。
这是解析器的解析代码的完整代码。 希望它能帮助那些坚持类似事情的其他人。
foreach (var tableFolder in Directory.GetDirectories(_exportFolder)) { //Popluate the schema of the DataTable DataTable table = new DataTable(); using (SqlDataAdapter ada = new SqlDataAdapter(String.Format("Select top 0 * from [{0}]", Path.GetFileName(tableFolder)), conn)) { ada.Fill(table); } //All of the files to import for this table string[] filePaths = Directory.GetFiles(tableFolder, "*.sql"); foreach (string file in filePaths) { string text; using (var txtRdr = new StreamReader(file)) { text = txtRdr.ReadToEnd(); } const string recordRegex = @"(?<=^\() #The begining of a line followed by a ( ((('(?.*?)'(?!')(?=[\s\)])) | # Something formatted like 'some text' supports line breaks (?-?[\d\.]+) | # Any numbers (X'(?[0-9a-f]*)') # Something formatted like X'0123456789abcdef' )(\s,\s)? # Spaces and commas between the records )+ # Repeat the pattern at least one time (?=(?<!'')\)[;,]\r?$) # The End of the line ending with ); or ), and not immedatly proceded by ''"; //Creates one match per row in the database var records = Regex.Matches(text, recordRegex, RegexOptions.Singleline | RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace | RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture); const string headerRegex = @"^INSERT\sINTO\s\[[\w_\-\s]+\]\s\(\s(?:\[([\w_\-\s]+)\]\s(?:,\s)?)+\)"; var header = Regex.Match(text, headerRegex).Groups[1].Captures.Cast().ToArray(); foreach (Match record in records) { //Due to how we captured the 3 groups we had to put them back in order in one list. var columns = record.Groups.Cast() .Skip(1) //Groups[0] contins the entire record. .SelectMany(group => group.Captures.Cast()) //Flattens all of the captures in the three groups in to one list .OrderBy(capture => capture.Index) //Reorder the combined list as the SelectMany will not be outputting the correct order. .ToArray(); DataRow row = table.NewRow(); for (int i = 0; i < columns.Length; i++) { Type columnType = table.Columns[header[i].Value].DataType; if (columnType == typeof(String)) { row[header[i].Value] = columns[i].Value; } else if (columnType == typeof(Int32)) { row[header[i].Value] = Convert.ToInt32(columns[i].Value); } else if (columnType == typeof(Double)) { row[header[i].Value] = Convert.ToDouble(columns[i].Value); } else if (columnType == typeof(Boolean)) { if (columns[i].Value == "0") row[header[i].Value] = false; else if (columns[i].Value == "1") row[header[i].Value] = true; else throw new InvalidDataException(); } else if (columnType == typeof(Int16)) { row[header[i].Value] = Convert.ToInt16(columns[i].Value); } else if (columnType == typeof(Byte[])) { row[header[i].Value] = StringToByteArray(columns[i].Value); } else { throw new NotImplementedException(); } } table.Rows.Add(row); } using (var bulkCopy = new SqlBulkCopy(conn)) { bulkCopy.DestinationTableName = Path.GetFileName(tableFolder); bulkCopy.BulkCopyTimeout = 0; bulkCopy.WriteToServer(table); } } }
更新：
通过将caputre组重命名为所有相同的名称.NET的正则表达式引擎将它们组合起来，这简化了
var columns = record.Groups[1].Cast().Skip(1).SelectMany(group => group.Captures.Cast()).OrderBy(capture => capture.Index).ToArray();
至
var columns = record.Groups[1].Captures.Cast().ToArray();
请注意，在Regex Hero页面上切换“CrLf标记行结束”设置会导致8行停止匹配; 这是导致问题的原因的线索。
在C＃代码中，文字字符串中的换行符被编码为CR / LF对（ "\r\n" ）。 正则表达式中的$ （与多行模式中的行尾匹配）仅匹配\n字符。 因此，正则表达式未考虑的最终逗号（或分号）之间存在额外的\r字符，并且匹配失败。
解决此问题的一些方法包括：
- 剥去回车符：
text = text.Replace("\r\n", "\n");， 要么 - 匹配回车：
string query = @"^\(.*?\)(,|;)\r$";