can i get only the substitution of the Regex.Replace?
Example.

String text = @"asdfgs sda gsa ga s
SECTOR:124 NAME:Ricko
asdfgs sda gsa ga s";
String regex = "^SECTOR:(\d ) NAME:(\w )";
String substitution = "$2 $1";

String result = Regex.Replace(text, regex, substitution);

Console.WriteLine(result);

Normal result

asdfgs sda gsa ga s
Ricko 124

Wanted result

Ricko 124

Thaaaanks

CodePudding user response：

You should use Regex.Match to extract the text and then concatenate Group 2 and Group 1 values:

Match m = Regex.Match(text, regex, RegexOptions.Multiline);
if (m.Success) {
    String result = $"{m.Groups[2].Value} {m.Groups[1].Value}";
    Console.WriteLine(result);
}

See the C# demo.

Note:

• RegexOptions.Multiline is added since your string contains multiple lines, and you need to match start of a line with ^
• Regex.Match returns the first match from the string
• if (m.Success) is used to check if there was a match with the given string and pattern
• m.Groups[1].Value contains the first capturing group value, m.Groups[2].Value contains the second capturing group value, etc.

CodePudding user response：

You are not matching all the characters around what you want to keep that should be deleted.

You could have the dot match a newline and using the multiline flag for the anchor.

(?sm).*?^SECTOR:(\d ) NAME:(\w ).*

The pattern matches:

• (?sm) Inline flags having the dot matching a newline and multiline
• .*? Match any character including a newline as least as possible
• ^ Start of string
• SECTOR:(\d ) NAME:(\w ) Capture 1 digits in group 1 for SECTOR: and capture 1 word chars in group 2 for NAME:
• .* Match the rest of the lines

Example

String text = @"asdfgs sda gsa ga s
SECTOR:124 NAME:Ricko
asdfgs sda gsa ga s";
String regex = @"(?sm).*?^SECTOR:(\d ) NAME:(\w ).*";
String substitution = "$2 $1";

String result = Regex.Replace(text, regex, substitution);

Console.WriteLine(result);

Output

Ricko 124