How do I get the words immediately before my regex condition?

user_399508 0
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RegEx to help me find :line in the stacktrace

\W*(:line)\W*

I am writing code to help highlight the file and line number when something crashes in HTML

Example Stacktrace

Microsoft.Data.SqlClient.SqlException (0x80131904): The conversion of a varchar data type to a datetime data type resulted in an out-of-range value. at Microsoft.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at Microsoft.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at Microsoft.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) at Microsoft.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) at Microsoft.Data.SqlClient.SqlDataReader.TryHasMoreRows(Boolean& moreRows) at Microsoft.Data.SqlClient.SqlDataReader.TryReadInternal(Boolean setTimeout, Boolean& more) at Microsoft.Data.SqlClient.SqlDataReader.<>c__DisplayClass196_0.<ReadAsync>b__1(Task t) at Microsoft.Data.SqlClient.SqlDataReader.InvokeRetryable[T](Func`2 moreFunc, TaskCompletionSource`1 source, IDisposable objectToDispose) --- End of stack trace from previous location where exception was thrown --- at ExampleProjectSystem.API.Services.ReportRepository.SearchCustomerByAdvanceFilters(TableBaseDto filter, String ReportName) in E:\SharedProjects\ExampleProjectAPI\Services\ReportRepository.cs:line 445

I'd only want ReportRepository.cs:line 445 so I can perform change the font/color/css in the HTML when viewing the crash.

regex c#
2 Answers

\w+\.\w+:line\s\d+ (check this out: https://regexr.com/65d2l)

Explanation:

  • First \w+ matches ReportRepository.
  • \. escapes the dot and matches it.
  • \w+ matches cs.
  • :line\s matches :line .
  • \d+ matches 445.
user_18175740

You can use

([^\s\\]+):line\s+(\d+)

See the .NET regex demo. Output:

enter image description here

Details:

  • ([^\s\\]+) - Capturing gropup 1: one or more chars other than whitespace and \
  • :line - a literal text
  • \s+ - one or more whitespaces
  • (\d+) - Group 2: one or more digits.

See the C# demo:

var text = @"ExampleProjectSystem.API.Services.ReportRepository.SearchCustomerByAdvanceFilters(TableBaseDto filter, String ReportName) in E:\SharedProjects\ExampleProjectAPI\Services\ReportRepository.cs:line 445";
var pattern = @"([^\s\\]+):line\s+(\d+)";
var result = Regex.Match(text, pattern);
if (result.Success) 
{
    Console.WriteLine(result.Groups[1].Value); // => ReportRepository.cs
    Console.WriteLine(result.Groups[2].Value); // => 445
}
user_38329700
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