Test, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {            
            Regex r = new Regex(@"ERROR[\S\s]*?(?=\s+INFO|DEBUG|WARN)");
            string text = @"ERROR 2017/12/12 00:11:34.352 Error: {0} System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> OutboundServiceSoftFailureException: Failure executing request against aggregation service: Object reference not set to an instance of an object. at ProxyAggregationService.Execute[T](ILog log, Request request) at ResetChangeRequestForMAF(String mafGuid, String senderCode) at HandleImpl(CleanupWorkbookRequest request) at UnitRequestHandler`1.Handle(TRequest request) at ExecuteInternal[TRequest,TResponse](TRequest request) --- End of inner exception stack trace --- at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at ExecuteUnknown(Object request) at InvokeMethodOnTarget() at CProceed() at Intercept(IInvocation invocation) at AbstractInvocation.Proceed() at Intercept(IInvocation invocation) at AbstractInvocation.Proceed() at Intercept(IInvocation invocation)

DEBUG 2017/12/12 00:11:35.300 Process entered blah blah bla

WARN 2017/12/12 00:11:37.300 Possible problem with some process
ERROR 2017/12/12 00:11:34.352 Error: {0} System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> OutboundServiceSoftFailureException: Failure executing request against aggregation service: Object reference not set to an instance of an object. at ProxyAggregationService.Execute[T](ILog log, Request request) at ResetChangeRequestForMAF(String mafGuid, String senderCode) at HandleImpl(CleanupWorkbookRequest request) at UnitRequestHandler`1.Handle(TRequest request) at ExecuteInternal[TRequest,TResponse](TRequest request) --- End of inner exception stack trace --- at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at ExecuteUnknown(Object request) at InvokeMethodOnTarget() at CProceed() at Intercept(IInvocation invocation) at AbstractInvocation.Proceed() at Intercept(IInvocation invocation) at AbstractInvocation.Proceed() at Intercept(IInvocation invocation)
    WARN 2017/12/12 00:11:37.300 Possible problem with some process

ERROR 2017/12/12 00:11:34.352 Error: {0} System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> OutboundServiceSoftFailureException: Failure executing request against aggregation service: Object reference not set to an instance of an object. at ProxyAggregationService.Execute[T](ILog log, Request request) at ResetChangeRequestForMAF(String mafGuid, String senderCode) at HandleImpl(CleanupWorkbookRequest request) at UnitRequestHandler`1.Handle(TRequest request) at ExecuteInternal[TRequest,TResponse](TRequest request) --- End of inner exception stack trace --- at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at ExecuteUnknown(Object request) at InvokeMethodOnTarget() at CProceed() at Intercept(IInvocation invocation) at AbstractInvocation.Proceed() at Intercept(IInvocation invocation) at AbstractInvocation.Proceed() at Intercept(IInvocation invocation)

TEST 2017/12/12 00:11:35.300 Process entered blah blah bla

INFO 2017/12/12 00:11:35.300 Process entered blah blah bla";
            
            MatchCollection matches = r.Matches(text);
        
            foreach (Match m in matches)
            {
                Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
            }
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,16 sec, absolute running time: 0,2 sec, cpu time: 0,17 sec, average memory usage: 20 Mb, average nr of threads: 4