[问题求助] [已解决]用正则表达式中的平衡组删除或修改特定字段

#--------------------------------------------------------------------情况1: 函数FUN1返回值类型void

$s1 = @'
using System;

public class CLA
{
	void FUN1()
	{
		Console.WriteLine("FUN1");
	}
}
'@

#--------------------------------------------------------------------情况2: 返回值类型改为了 string

$s2 = @'
using System;

public class CLA
{
	string FUN1()
	{
		return "FUN1";
	}
}
'@

#--------------------------------------------------------------------情况3: 加了修饰词 public

$s3 = @'
using System;

public class CLA
{
	public void FUN1()
	{
		Console.WriteLine("FUN1");
	}
}
'@

#--------------------------------------------------------------------情况4: 加了修饰词 public static

$s4 = @'
using System;

public class CLA
{
	public static string FUN1()
	{
		return "FUN1";
	}
}
'@

# 使用正则表达式删除指定函数
$s1 -replace '(?s)void\s+FUN1\s*\(\s*\)\s*\{(?:[^{}]+|\{(?<DEPTH>)|\}(?<-DEPTH>))*?(?(DEPTH)(?!))\}'
$s2 -replace '(?s)string\s+FUN1\s*\(\s*\)\s*\{(?:[^{}]+|\{(?<DEPTH>)|\}(?<-DEPTH>))*?(?(DEPTH)(?!))\}'
$s3 -replace '(?s)public void\s+FUN1\s*\(\s*\)\s*\{(?:[^{}]+|\{(?<DEPTH>)|\}(?<-DEPTH>))*?(?(DEPTH)(?!))\}'
$s4 -replace '(?s)public static string\s+FUN1\s*\(\s*\)\s*\{(?:[^{}]+|\{(?<DEPTH>)|\}(?<-DEPTH>))*?(?(DEPTH)(?!))\}'
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.*FUN1\s*\(\s*\)\s*\{(?:[^{}]+|\{(?<DEPTH>)|\}(?<-DEPTH>))*?(?(DEPTH)(?!))\}
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$s1 -replace '.*(FUN1\s*\(\s*\)\s*\{(?:[^{}]+|\{(?<DEPTH>)|\}(?<-DEPTH>))*?(?(DEPTH)(?!))\})','public static $1'
$s1 -replace '.*(CLA\s*\{(?:[^{}]+|\{(?<DEPTH>)|\}(?<-DEPTH>))*?(?(DEPTH)(?!))\})','private $1'
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$s1 -replace '.*(FUN1\s*\(\s*\)\s*\{(?:[^{}]+|\{(?<DEPTH>)|\}(?<-DEPTH>))*?(?(DEPTH)(?!))\})','public static $1'
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// 返回Nullable类型
int? GetNullableInt()
{
    int? result = null;
    return result;
}

// 返回Tuple类型
(string, int) GetPersonInfo()
{
    string name = "张三";
    int age = 20;
    return (name, age);
}

// 返回IEnumerable类型
IEnumerable<int> GetNumbers()
{
    yield return 1;
    yield return 2;
    yield return 3;
}

// 返回Task类型
async Task<string> DownloadFileAsync(string url)
{
    HttpClient client = new HttpClient();
    HttpResponseMessage response = await client.GetAsync(url);
    string content = await response.Content.ReadAsStringAsync();
    return content;
}
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$s1 -replace '(?<a>\s*)(private|public|static|async|(?<b>(string|void|int\?|\(string, int\)|IEnumerable<int>|Task<string>)\s*)|\s*)*(?<c>FUN1\s*\(\s*\)\s*\{(?:[^{}]+|\{(?<DEPTH>)|\}(?<-DEPTH>))*?(?(DEPTH)(?!))\})','${a}public static ${b}${c}'
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$s1 -replace '(?<a>\s*)(private|public|static|async|(?<b>(\b\S+|\([^()]+\))\s*)|\s*)*(?<c>FUN1\s*\(\s*\)\s*\{(?:[^{}]+|\{(?<DEPTH>)|\}(?<-DEPTH>))*?(?(DEPTH)(?!))\})','${a}public static ${b}${c}'
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