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General string parsing techniques

, 28 Oct 2011 CPOL 5.2K 1
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I would have actually opted to remove the start index being passed in. Then, you can spruce up the calls with extension methods (albeit not necessary).Usage:removeList.AddRange(html.ToString().GetBetween("");Code:public static class StringUtilities{ ///...
I would have actually opted to remove the start index being passed in. Then, you can spruce up the calls with extension methods (albeit not necessary). Usage:
removeList.AddRange(html.ToString().GetBetween("<img id=", " />");
Code:
public static class StringUtilities
{
  /// <summary>
  /// Gets a string that has the provided start and end.
  /// </summary>
  /// <param name="source">The source string to search.</param>
  /// <param name="start">The start of the string.</param>
  /// <param name="end">The end of the string.</param>
  /// <param name="includeTokens">Indicates whether to include the token strings or not in the returned value.</param>
  /// <returns>A string starting with start and ending with end.</returns>
  public static IEnumerable<string> GetBetween(this string source, string start, string end, bool includeTokens = false)
  {
     int currentIndex, startIndex, endIndex;

     currentIndex = 0;

     while (currentIndex < source.Length)
     {
       if (((startIndex = source.IndexOf(start, currentIndex)) != -1)
        && ((endIndex = source.IndexOf(end, startIndex + start.Length)) != -1))
       {
          currentIndex = endIndex + end.Length;

          if (includeTokens)
            yield return source.Substring(startIndex, endIndex - startIndex + end.Length);
          else
            yield return source.Substring(startIndex + start.Length, endIndex - startIndex - start.Length);
       }
       else
       {
         yield break;
       }
     }
  }
}

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Andrew Rissing
Software Developer (Senior)
United States United States
Since I've begun my profession as a software developer, I've learned one important fact - change is inevitable. Requirements change, code changes, and life changes. So..If you're not moving forward, you're moving backwards.

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Comments and Discussions

 
GeneralRe: You are probably correct, but I doubt if the difference is s... Pin
ChunkyStool1-Nov-11 12:14
memberChunkyStool1-Nov-11 12:14 
GeneralRe: but I did approve it, I hope it does work :) Pin
rj451-Nov-11 9:40
memberrj451-Nov-11 9:40 
GeneralI submitted the regex alternative again. Maybe a few code c... Pin
ChunkyStool1-Nov-11 9:37
memberChunkyStool1-Nov-11 9:37 
GeneralNot sure why my regex alternative wasn't good enough for pub... Pin
ChunkyStool1-Nov-11 8:34
memberChunkyStool1-Nov-11 8:34 
GeneralRe: It would be pretty slow alternative in terms of performance. Pin
rj451-Nov-11 9:39
memberrj451-Nov-11 9:39 
GeneralHave you considered using regular expressions? Pin
ChunkyStool31-Oct-11 14:05
memberChunkyStool31-Oct-11 14:05 
GeneralRe: Indeed, I have. Oddly enough, your alternate was removed. ... Pin
Andrew Rissing1-Nov-11 5:14
memberAndrew Rissing1-Nov-11 5:14 
GeneralReason for my vote of 4 Definitely an improvement to tie int... Pin
Henry.Ayoola27-Oct-11 23:11
memberHenry.Ayoola27-Oct-11 23:11 
GeneralRe: Easy enough to do. It is a minor code smell, but smelly it ... Pin
Andrew Rissing28-Oct-11 4:06
memberAndrew Rissing28-Oct-11 4:06 
GeneralReason for my vote of 4 pretty cool Pin
rj4527-Oct-11 17:12
memberrj4527-Oct-11 17:12 

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