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Posted 6 Jun 2012

Sorting Strings Based on the Position of the Block Letter

, 6 Jun 2012
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This is an alternative for "Sorting Strings based on the position of the block letter"


Here's an IComparer that implements the spec as I understand it. It uses a Regular Expression to find the indices of the first uppercase letters.

namespace PIEBALD.Types
  public sealed class WackyComparer : System.Collections.Generic.IComparer<string>
    private static readonly System.Text.RegularExpressions.Regex reg ;
    static WackyComparer
      /* A Regex to find an uppercase letter */
      reg = new System.Text.RegularExpressions.Regex ( "[A-Z]" ) ;

      return ;

    public int
      string Op0
      string Op1
      int result = 0 ;

      /* Null protection left as an exercise */

      System.Text.RegularExpressions.Match mat ;

      /* If the Regex matches the strings, then use the indices, else Max */
      int index0 = ( mat = reg.Match ( Op0 )).Success ? mat.Index : System.Int32.MaxValue ;
      int index1 = ( mat = reg.Match ( Op1 )).Success ? mat.Index : System.Int32.MaxValue ;

      /* Compare the indices, if equal compare the strings as normal */
      if ( ( result = index0 - index1 ) == 0 )
        result = Op0.CompareTo ( Op1 ) ;

      return ( result ) ;


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


About the Author

Software Developer (Senior)
United States United States
BSCS 1992 Wentworth Institute of Technology

Originally from the Boston (MA) area. Lived in SoCal for a while. Now in the Phoenix (AZ) area.

OpenVMS enthusiast, ISO 8601 evangelist, photographer, opinionated SOB, acknowledged pedant and contrarian


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Comments and Discussions

QuestionThis is only half of the story... Pin
Andreas Gieriet7-Jun-12 12:34
memberAndreas Gieriet7-Jun-12 12:34 
AnswerRe: This is only half of the story... Pin
PIEBALDconsult7-Jun-12 13:51
memberPIEBALDconsult7-Jun-12 13:51 
GeneralRe: This is only half of the story... Pin
Andreas Gieriet7-Jun-12 14:04
memberAndreas Gieriet7-Jun-12 14:04 
GeneralComments Pin
PIEBALDconsult6-Jun-12 12:57
memberPIEBALDconsult6-Jun-12 12:57 
GeneralRe: Comments Pin
CaldasGSM6-Jun-12 14:25
memberCaldasGSM6-Jun-12 14:25 
GeneralRe: Comments Pin
PIEBALDconsult6-Jun-12 18:14
memberPIEBALDconsult6-Jun-12 18:14 
GeneralRe: Comments Pin
CaldasGSM7-Jun-12 5:54
memberCaldasGSM7-Jun-12 5:54 
SuggestionRe: Comments Pin
Andreas Gieriet7-Jun-12 12:28
memberAndreas Gieriet7-Jun-12 12:28 

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