filter/find

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Management.Automation;
using System.Management.Automation.Runspaces;
using System.Collections.ObjectModel;

namespace WindowsFormsApplication1
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
            label5.Hide();
            label6.Hide();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            using (var dialog = new System.Windows.Forms.FolderBrowserDialog())
            {
                System.Windows.Forms.DialogResult result = dialog.ShowDialog();
                label5.Text = dialog.SelectedPath;
                label5.Show();
            }


        }

        private void button3_Click(object sender, EventArgs e)
        {
            this.Hide();
            Form1 myForm = new Form1();
            myForm.Show();
        }

        private void button5_Click(object sender, EventArgs e)
        {
            this.Hide();
            Form1 myForm = new Form1();
            myForm.Show();
        }

        private void button6_Click(object sender, EventArgs e)
        {
            this.Hide();
            Form3 myForm = new Form3();
            myForm.Show();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            using (var dialog = new System.Windows.Forms.OpenFileDialog())
            {
                System.Windows.Forms.DialogResult result = dialog.ShowDialog();
                label6.Text = dialog.FileName;
                label6.Show();
            }
        }

        private void button4_Click(object sender, EventArgs e)
        {
            string filter = textBox1.Text;
            string folder = label5.Text;
            string output = label6.Text;

            String[] substrings = folder.Split('\\');
            folder = "";
            foreach(string substring in substrings){
                folder = folder + substring + "\\" + "\\";
            }

            String[] substringsOutput = output.Split('\\');
            output = "";
            foreach (string substringOutput in substringsOutput)
            {
                output = output + substringOutput + "\\" + "\\";
            }

            output = output.Remove(output.Length - 2);

            Runspace runspace = RunspaceFactory.CreateRunspace();

            runspace.Open();

            Pipeline pipeline = runspace.CreatePipeline();
            var filterEscaped = "\"" + filter + "\\" + "\"";

            string jqExecuteCommand = "jq -r 'select(.text | tostring | contains(\\" + filterEscaped + ")) | [.text] | select(length > 0) | @csv' " + " $files[$i].FullName " + "  >> " + output;
            string fileLoopCommand = "$files = Get-ChildItem " + folder + " -Recurse -Include *.json" + "\n" + "for($i=0; $i -lt $files.Count; $i++) {" + jqExecuteCommand +"}";

            pipeline.Commands.AddScript(fileLoopCommand);

            pipeline.Commands.Add("Out-String");

            Collection<PSObject> results = pipeline.Invoke("Set-ExecutionPolicy Unrestricted");

            runspace.Close();

        }
    }
}