https://stackoverflow.com/questions/50121208

slowregextest.cs

void Main()
{
	var makeOutput = @"ASM startup file ...Done.
	
	.\make.exe : In file included from ../../../dist/win/bin/ARMToolchain/Drivers/STM32F7xx_HAL_Driver/Inc/stm32f7xx_hal_rc
	c.h:45:0,
	At line:1 char:1
	+ .\make.exe all 2>&1 > abc.txt
	+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	    + CategoryInfo          : NotSpecified: (In file include...hal_rcc.h:45:0,:String) [], RemoteException
	    + FullyQualifiedErrorId : NativeCommandError
	
	                 from ../../../source/base/pro/inc/stm32f7xx_hal_conf.h:252,
	                 from ../../../dist/win/bin/ARMToolchain/Drivers/STM32F7xx_HAL_Driver/Inc/stm32f7xx_hal.h:46,
	                 from ../../../source/base/pro/inc/main.h:4,
	                 from ../../../source/base/pro/boot/main.cpp:50:
	../../../source/base/pro/boot/main.cpp: In function 'int main()':
	../../../dist/win/bin/ARMToolchain/Drivers/STM32F7xx_HAL_Driver/Inc/stm32f7xx_hal_rcc_ex.h:691:48: warning: conversion 
	to void will not access object of type 'volatile uint32_t {aka volatile long unsigned int}'
	                                         UNUSED(tmpreg); \
	
	../../../dist/win/bin/ARMToolchain/Drivers/STM32F7xx_HAL_Driver/Inc/stm32f7xx_hal_def.h:83:27: note: in definition of m
	acro 'UNUSED'
	 #define UNUSED(x) ((void)(x))
	                           ^
	../../../source/base/pro/boot/main.cpp:100:2: note: in expansion of macro '__HAL_RCC_GPIOF_CLK_ENABLE'
	  __HAL_RCC_GPIOF_CLK_ENABLE();
	  ^~~~~~~~~~~~~~~~~~~~~~~~~~
	
	../../../dist/win/bin/ARMToolchain/Drivers/STM32F7xx_HAL_Driver/Inc/stm32f7xx_hal_rcc_ex.h:651:48: warning: conversion 
	to void will not access object of type 'volatile uint32_t {aka volatile long unsigned int}'
	                                         UNUSED(tmpreg); \
	
	../../../dist/win/bin/ARMToolchain/Drivers/STM32F7xx_HAL_Driver/Inc/stm32f7xx_hal_def.h:83:27: note: in definition of m
	acro 'UNUSED'
	 #define UNUSED(x) ((void)(x))
	                           ^
	../../../source/base/pro/boot/main.cpp:101:2: note: in expansion of macro '__HAL_RCC_GPIOA_CLK_ENABLE'
	  __HAL_RCC_GPIOA_CLK_ENABLE();
	  ^~~~~~~~~~~~~~~~~~~~~~~~~~
	
	../../../source/base/pro/boot/main.cpp: At global scope:
	../../../source/base/pro/boot/main.cpp:150:1: error: 'sad' does not name a type
	 sad
	 ^~~
	
	In file included from ../../../dist/win/bin/ARMToolchain/Drivers/STM32F7xx_HAL_Driver/Inc/stm32f7xx_hal_rcc.h:45:0,
	                 from ../../../source/base/pro/inc/stm32f7xx_hal_conf.h:252,
	                 from ../../../dist/win/bin/ARMToolchain/Drivers/STM32F7xx_HAL_Driver/Inc/stm32f7xx_hal.h:46,
	                 from ../../../source/base/pro/inc/main.h:4,
	                 from ../../../source/base/pro/boot/main.cpp:50:
	../../../source/base/pro/boot/main.cpp: In function 'void SystemClock_Config()':
	../../../dist/win/bin/ARMToolchain/Drivers/STM32F7xx_HAL_Driver/Inc/stm32f7xx_hal_rcc.h:466:48: warning: conversion to 
	void will not access object of type 'volatile uint32_t {aka volatile long unsigned int}'
	                                         UNUSED(tmpreg); \
	
	../../../dist/win/bin/ARMToolchain/Drivers/STM32F7xx_HAL_Driver/Inc/stm32f7xx_hal_def.h:83:27: note: in definition of m
	acro 'UNUSED'
	 #define UNUSED(x) ((void)(x))
	                           ^
	../../../source/base/pro/boot/main.cpp:231:5: note: in expansion of macro '__HAL_RCC_PWR_CLK_ENABLE'
	     __HAL_RCC_PWR_CLK_ENABLE();
	     ^~~~~~~~~~~~~~~~~~~~~~~~
	
	../../../dist/win/bin/ARMToolchain/Drivers/STM32F7xx_HAL_Driver/Inc/stm32f7xx_hal_pwr.h:186:68: warning: conversion to 
	void will not access object of type 'volatile uint32_t {aka volatile long unsigned int}'
	                                                             UNUSED(tmpreg);                                     \
	
	../../../dist/win/bin/ARMToolchain/Drivers/STM32F7xx_HAL_Driver/Inc/stm32f7xx_hal_def.h:83:27: note: in definition of m
	acro 'UNUSED'
	 #define UNUSED(x) ((void)(x))
	                           ^
	../../../source/base/pro/boot/main.cpp:233:5: note: in expansion of macro '__HAL_PWR_VOLTAGESCALING_CONFIG'
	     __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
	     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	
	> 100,0 % : C++ main.cpp   ........................   Makefile:541: recipe for target 'obj/93_main.o' failed
	make: *** [obj/93_main.o] Error 1";

	string patternStr = @"([^:^\n]+):(\d+):(\d+):\s(\w+\s*\w*):\s(.+)\n(\s+)(.*)\s+\^+";
	Regex regex = new Regex(patternStr, RegexOptions.Compiled);
	Timing.Measure(() =>
	{
		MatchCollection match = regex.Matches(makeOutput);
		var matches = match.Cast<Match>().ToList();
	}, 3, 100).Dump();
}

public static class Timing
{
	public static TimeSpan Measure(Action a, int warmupIters, int iters)
	{
		var allIters = new[] { warmupIters, iters };
		Stopwatch sw = null;
		foreach (var iterCount in allIters)
		{
			sw = Stopwatch.StartNew();
			for (var i = 0; i < iterCount; ++i)
			{
				a();
			}
		}
		return sw.Elapsed;
	}
}