[问题求助] PowerShell使用正则将多行文本中的键值整理出来

sss A=
Key 1
sss Av=
Hello 1
World 1
Av.fff
 
sss B=
Key 2
sss Bv=
Hello 2
 
World 2
Bv.fff
 
sss C=
Key 3
sss Cv=
Hello 3
World 3
Cv.fff
 
sss kv=
@
{A}={Av}
{B}={Bv}
{C}={Cv}
DDD(kv)COPY

/sss [^ ]=/ {
	A = substr($0, 1, 5) "v="
	B = substr($0, 5, 1) "v.fff"
	while ((getline) > 0) {
		if ($0 == B) {
			print "---"
			next
		}
		if ($0 == A) {
			print "-"
		} else {
			print
		}
	}
}COPY

gawk -f.\1.awk 1.txt>2.txtCOPY

Key 1
-
Hello 1
World 1
---
Key 2
-
Hello 2
 
World 2
---
Key 3
-
Hello 3
World 3
---COPY

$s = @'
sss A=
 Key 1
sss Av=
 Hello 1
 World 1
Av.fff 
 
sss B=
 Key 2
sss Bv=
 Hello 2
 
 World 2
Bv.fff
 
sss C=
 Key 3
sss Cv=
 Hello 3
 World 3
Cv.fff
 
sss kv=
@
 {A}={Av}
 {B}={Bv}
 {C}={Cv}
DDD(kv)
'@
 
[regex]::Replace($s, "(?sm)(?:(?!Key).)*Key\s*(\d+)(?:(?!\w+\s*\1).)*(?<m>(?:(?!\r?\n\s*\w+v\.fff).)*)","Key `$1`r`n-`r`n`${m}`r`n---`r`n") -replace '(?s)\r?\n?\s*(---)(?:(?!\1).)*$' -replace '(?m)^ +(\w+)','$1';
 
或
([regex]::Matches($s,"(?is)Key(?:(?!\r?\n?\w+v\.fff).)*").Value -join "`r`n---`r`n") -replace '(?m)(?:(?!v=).)*v=','-' -replace '(?m)^ +(\w+)','$1';
 
或 自己弄COPY

$s -replace '(?s)sss (?<a>.)=\s*(.+)\s*sss (\k<a>)v=\s*(.+)\s*(\k<a>)v.fff\s*',"`$1-`r`n`$3---`r`n" -replace '(?s)\s*---\s*sss kv=.+|(?m)^ +'COPY

https://learn.microsoft.com/zh-cn/dotnet/standard/base-types/regular-expression-language-quick-referenceCOPY

$s = @'
public static
{
#if A
    part1
#endif
 
part
part
 
#if V
    part2
#endif
 
part
part
 
#if C
    part3
#endif
}
'@
 
$rx = [regex]'#if.*(?s)(.*?)#endif'
$rx.Matches($s) |
%{
	$_.Groups[1].Value
}COPY