    ﻿using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Text.RegularExpressions;

    namespace Nikse.SubtitleEdit.Core.SubtitleFormats
    {
        public class UnknownSubtitle44 : SubtitleFormat
        {

            //>>> "COMMON GROUND" IS FUNDED BY  10:01:04:12                         1
            //THE MINNESOTA ARTS AND CULTURAL   10:01:07:09
            private static readonly Regex RegexTimeCodes1 = new Regex(@" \d\d:\d\d:\d\d:\d\d$", RegexOptions.Compiled);
            private static readonly Regex RegexTimeCodes2 = new Regex(@" \d\d:\d\d:\d\d:\d\d         +\d+$", RegexOptions.Compiled);

            public override string Extension => ".txt";

            public override string Name => "Unknown 44";

            public override string ToText(Subtitle subtitle, string title)
            {
                var sb = new StringBuilder();
                int index = 0;
                int index2 = 0;
                foreach (Paragraph p in subtitle.Paragraphs)
                {
                    index++;
                    var text = new StringBuilder();
                    text.Append(HtmlUtil.RemoveHtmlTags(p.Text.Replace(Environment.NewLine, " ")));
                    while (text.Length < 34)
                        text.Append(' ');
                    sb.AppendFormat("{0}{1}", text, EncodeTimeCode(p.StartTime));
                    if (index % 50 == 1)
                    {
                        index2++;
                        sb.Append(new string(' ', 25) + index2);
                    }
                    sb.AppendLine();
                    Paragraph next = subtitle.GetParagraphOrDefault(index);
                    if (next != null && next.StartTime.TotalMilliseconds - p.EndTime.TotalMilliseconds > 150)
                    {
                        text.Clear();
                        while (text.Length < 34)
                            text.Append(' ');
                        sb.AppendLine(string.Format("{0}{1}", text, EncodeTimeCode(p.EndTime)));
                    }
                }
                return sb.ToString();
            }

            private static string EncodeTimeCode(TimeCode time)
            {
                return string.Format("{0:00}:{1:00}:{2:00}:{3:00}", time.Hours, time.Minutes, time.Seconds, MillisecondsToFramesMaxFrameRate(time.Milliseconds));
            }

            public override void LoadSubtitle(Subtitle subtitle, List<string> lines, string fileName)
            {
                _errorCount = 0;
                Paragraph p = null;
                subtitle.Paragraphs.Clear();
                foreach (string line in lines)
                {
                    string s = line.Trim();
                    var match = RegexTimeCodes2.Match(s);
                    if (match.Success)
                    {
                        s = s.Substring(0, match.Index + 13).Trim();
                    }
                    match = RegexTimeCodes1.Match(s);
                    if (match.Success && match.Index > 13)
                    {
                        string text = s.Substring(0, match.Index).Trim();
                        string timeCode = s.Substring(match.Index).Trim();

                        string[] startParts = timeCode.Split(SplitCharColon, StringSplitOptions.RemoveEmptyEntries);
                        if (startParts.Length == 4)
                        {
                            try
                            {
                                p = new Paragraph(DecodeTimeCodeFramesFourParts(startParts), new TimeCode(), text);
                                subtitle.Paragraphs.Add(p);
                            }
                            catch (Exception exception)
                            {
                                _errorCount++;
                                System.Diagnostics.Debug.WriteLine(exception.Message);
                            }
                        }
                    }
                    else if (string.IsNullOrWhiteSpace(line) || RegexTimeCodes1.IsMatch("   " + s))
                    {
                        // skip empty lines
                    }
                    else if (!string.IsNullOrWhiteSpace(line) && p != null)
                    {
                        _errorCount++;
                    }
                }

                for (int i = 0; i < subtitle.Paragraphs.Count; i++)
                {
                    Paragraph current = subtitle.Paragraphs[i];
                    Paragraph next = subtitle.GetParagraphOrDefault(i + 1);
                    if (next != null)
                        current.EndTime.TotalMilliseconds = next.StartTime.TotalMilliseconds - Configuration.Settings.General.MinimumMillisecondsBetweenLines;
                    else
                        current.EndTime.TotalMilliseconds = current.StartTime.TotalMilliseconds + Utilities.GetOptimalDisplayMilliseconds(current.Text);

                    if (current.Duration.TotalMilliseconds > Configuration.Settings.General.SubtitleMaximumDisplayMilliseconds)
                        current.EndTime.TotalMilliseconds = current.StartTime.TotalMilliseconds + Configuration.Settings.General.SubtitleMaximumDisplayMilliseconds;
                }
                subtitle.RemoveEmptyLines();
                subtitle.Renumber();
            }

        }
    }

↑ V3095 The 'line' object was used before it was verified against null. Check lines: 63, 90.

↑ V3063 A part of conditional expression is always true if it is evaluated: !string.IsNullOrWhiteSpace(line).