Regex Help

#!/usr/bin/perl
# Please note that this regex generator is still in BETA (v0.9BETA). If there's an error, please click the Bug Report button on the site
# URL that generated this code:
# https://www.txt2regex.com/generator/?txt=user%40localhost+%5B2023-08-08%5D%24+ping+127.0.0.1&sel=25%2C47%2C9%2C-4%2C-107

    $txt = "user\@localhost [2023-08-08]\$ ping 127.0.0.1";      
	$re0 = "(user)";
	$re1 = "(.)";
	$re2 = ".*?";
	$re3 = "(\\s+)";
	$re4 = ".*?";
	$re5 = "(.)";
	$re6 = ".*?";
	$re7 = "(0)";
    $pattern = $re0.$re1.$re2.$re3.$re4.$re5.$re6.$re7;
    if ($txt =~ m/$pattern/i)
    {
        $int1=$1;
        print "($int1) \n";
    }
#-----
# Paste the code into a new perl file. Then in Unix:
# $ perl x.pl 
#-----

// Please note that this regex generator is still in BETA (v0.9BETA). If there's an error, please click the Bug Report button on the site
// This code is generated from: 
// https://www.txt2regex.com/generator/?txt=user%40localhost+%5B2023-08-08%5D%24+ping+127.0.0.1&sel=25%2C47%2C9%2C-4%2C-107
//
#include <iostream>
#include <string>
#include <regex>
#include <stdlib.h>

using namespace std;

int main() {
    string txt = "user@localhost [2023-08-08]$ ping 127.0.0.1";
	string re0 = "(user)";
	string re1 = "(.)";
	string re2 = ".*?";
	string re3 = "(\\s+)";
	string re4 = ".*?";
	string re5 = "(.)";
	string re6 = ".*?";
	string re7 = "(0)";
    string pattern = re0 + re1 + re2 + re3 + re4 + re5 + re6 + re7;

    regex reg(pattern, regex_constants::icase);
    smatch match;

    if (regex_search(txt, match, reg)) {
        string int1 = match[1].str();
        cout << "(" << int1 << ")" << endl;
    }

    return 0;
} 

//-----
// Reference: // http://en.cppreference.com/w/cpp/regex
//
// Compile and run on Unix using 
// # c++ x.cpp 
// # ./a.out
// 

// Please note that this regex generator is still in BETA (v0.9BETA). If there's an error, please click the Bug Report button on the site
// This code is generated from: 
// https://www.txt2regex.com/generator/?txt=user%40localhost+%5B2023-08-08%5D%24+ping+127.0.0.1&sel=25%2C47%2C9%2C-4%2C-107
//
import java.util.regex.*;
class Main
{
  public static void main(String[] args)
  {
    String txt="user@localhost [2023-08-08]$ ping 127.0.0.1";
	string re0 = "(user)";
	string re1 = "(.)";
	string re2 = ".*?";
	string re3 = "(\\s+)";
	string re4 = ".*?";
	string re5 = "(.)";
	string re6 = ".*?";
	string re7 = "(0)";
    string pattern = re0 + re1 + re2 + re3 + re4 + re5 + re6 + re7;
    
    Pattern p = Pattern.compile(pattern, Pattern.CASE_INSENSITIVE | Pattern.DOTALL);
    Matcher m = p.matcher(txt);
    if (m.find())
    {
        String int1=m.group(1);
        System.out.print("("+int1.toString()+")"+"\n");
    }
  }
}
//-----
// This code is for use with Java VM - see https://openjdk.org for downloads. 
//
// Paste the code into a new java application or a file called 'Main.java'
//
// Compile and run in Unix using:
// # javac Main.java 
// # java Main 
//

// Please note that this regex generator is still in BETA (v0.9BETA). If there's an error, please click the Bug Report button on the site
// This code is generated from: 
// https://www.txt2regex.com/generator/?txt=user%40localhost+%5B2023-08-08%5D%24+ping+127.0.0.1&sel=25%2C47%2C9%2C-4%2C-107
//
using System;
using System.Text.RegularExpressions;
namespace ConsoleApplication1;

class Program
{

  public static bool useRegex(String input)
  {
      const Regex regex = new Regex("%1\$s"%2\$s);
      return regex.IsMatch(input);
  }

  static void Main(string[] args)
  {
    string txt = "user@localhost [2023-08-08]$ ping 127.0.0.1";
  	string re0 = "(user)";
	string re1 = "(.)";
	string re2 = ".*?";
	string re3 = "(\\s+)";
	string re4 = ".*?";
	string re5 = "(.)";
	string re6 = ".*?";
	string re7 = "(0)";
    string pattern = re0 + re1 + re2 + re3 + re4 + re5 + re6 + re7;

    Regex r = new Regex(pattern,);
    Match m = r.Match(txt);
    if (m.Success)
    {
          String int1 = m.Groups[1].ToString();
          Console.Write("(" + int1.ToString() + ")"+"\n");
    }
    Console.ReadLine();
  }
}

//-----
// Paste the code into a new Console Application
//-----

' Please note that this regex generator is still in BETA (v0.9BETA). If there's an error, please click the Bug Report button on the site
' Generated automatically from the following URL:
' https://www.txt2regex.com/generator/?txt=user%40localhost+%5B2023-08-08%5D%24+ping+127.0.0.1&sel=25%2C47%2C9%2C-4%2C-107
Imports System.Text.RegularExpressions

Module Main
    Sub Main()
        Dim txt As String = "user@localhost [2023-08-08]\$ ping 127.0.0.1"

	Dim re0 As String = "(user)"
	Dim re1 As String = "(.)"
	Dim re2 As String = ".*?"
	Dim re3 As String = "(\\s+)"
	Dim re4 As String = ".*?"
	Dim re5 As String = "(.)"
	Dim re6 As String = ".*?"
	Dim re7 As String = "(0)"

        Dim pattern As String = re0 & re1 & re2 & re3 & re4 & re5 & re6 & re7

        Dim regex As New Regex(pattern, RegexOptions.IgnoreCase Or RegexOptions.Singleline)
        Dim match As Match = regex.Match(txt)

        If match.Success Then
            Dim int1 As String = match.Groups(1).Value
            Console.WriteLine("(" & int1 & ")")
        End If
    End Sub
End Module

// Please note that this regex generator is still in BETA (v0.9BETA). If there's an error, please click the Bug Report button on the site
// This code is generated from: 
// https://www.txt2regex.com/generator/?txt=user%40localhost+%5B2023-08-08%5D%24+ping+127.0.0.1&sel=25%2C47%2C9%2C-4%2C-107
//
program Main;

uses
  RegExpr;

var
  txt, pattern, re0, re1, re2, re3, re4, re5, re6, re7 : string;
  regex: TRegExpr;
  int1: string;

begin
  txt := 'user@localhost [2023-08-08]$ ping 127.0.0.1';
  re0 := '(user)';
  re1 := '(.)';
  re2 := '.*?';
  re3 := '(\s+)';
  re4 := '.*?';
  re5 := '(.)';
  re6 := '.*?';
  re7 := '(0)';
  pattern := re0 + re1 + re2 + re3 + re4 + re5 + re6 + re7;

  regex := TRegExpr.Create;
  regex.ModifierI := True;  // Enable case-insensitive matching

  regex.Expression := pattern;

  if regex.Exec(txt) then
  begin
    int1 := regex.Match[1];
    WriteLn('(', int1, ')');
  end;

  regex.Free;
end.

#!/usr/bin/python
# Please note that this regex generator is still in BETA (v0.9BETA). If there's an error, please click the Bug Report button on the site
# Generated automatically from the following URL:
# https://www.txt2regex.com/generator/?txt=user%40localhost+%5B2023-08-08%5D%24+ping+127.0.0.1&sel=25%2C47%2C9%2C-4%2C-107

import re

txt = "user@localhost [2023-08-08]$ ping 127.0.0.1"
re0 = "(user)";
re1 = "(.)";
re2 = ".*?";
re3 = "(\\s+)";
re4 = ".*?";
re5 = "(.)";
re6 = ".*?";
re7 = "(0)";
pattern = re0 + re1 + re2 + re3 + re4 + re5 + re6 + re7;
rg = re.compile(pattern, re.IGNORECASE | re.DOTALL)
m = rg.search(txt)
if m:
    int1 = m.group(1)
    print ("("+int1+")"+"\n")
    
#-----
# Paste the code into a new python file. Then execute:
# $ python3 test.py 
#-----

#!/usr/bin/ruby
# Please note that this regex generator is still in BETA (v0.9BETA). If there's an error, please click the Bug Report button on the site
# Generated automatically from the following URL:
# https://www.txt2regex.com/generator/?txt=user%40localhost+%5B2023-08-08%5D%24+ping+127.0.0.1&sel=25%2C47%2C9%2C-4%2C-107

txt = "user@localhost [2023-08-08]$ ping 127.0.0.1"
re0 = "(user)";
re1 = "(.)";
re2 = ".*?";
re3 = "(\\s+)";
re4 = ".*?";
re5 = "(.)";
re6 = ".*?";
re7 = "(0)";
pattern = re0 + re1 + re2 + re3 + re4 + re5 + re6 + re7;

m=Regexp.new(pattern, Regexp::IGNORECASE);
if m.match(txt)
    int1=m.match(txt)[1];
    puts "("<<int1<<")"<< "\n"
end
#-----
# Paste the code into a new ruby file. Then execute:
# $ ruby test.ruby
#-----