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How to Split Long Strings into Manageable Portions and Display them in a MessageBox

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16 Jun 2014CPOL 17.2K   9   14
This is an alternative for "How to Split Long Strings into Manageable Portions and Display them in a MessageBox"

In the past, I have written code similar to that in the related Tip, but for any who like Regular Expressions, here is a Regular Expression that will split a string into segments with a maximum length, but which has the ability to split on "breaks" so words aren't broken up: (?s).{1,314}(?=(\b|$))

private static System.Collections.Generic.IEnumerable<string>
  string text
  int    maxlen
  string regex = System.String.Format ( @"(?s).{{1,{0}}}(?=(\b|$))" , maxlen ) ;

  System.Text.RegularExpressions.Regex reg = new System.Text.RegularExpressions.Regex ( regex ) ;

  System.Text.RegularExpressions.MatchCollection m = reg.Matches ( text ) ;

  for ( int i = 0 ; i < m.Count ; i++ )
    yield return ( m [ i ].Value ) ;

  yield break ;

        int MAX_CHARS_TO_SHOW = 314;
        string msg = "YOU don't know about me without you have read a book by the name of The Adventures of Tom Sawyer; but that ain't no matter. " +
            "That book was made by Mr. Mark Twain, and he told the truth, mainly. There was things which he stretched, but mainly he told the truth. "+
            "That is nothing. I never seen anybody but lied one time or another, without it was Aunt Polly, or the widow, or maybe Mary. Aunt Polly -- "+
            "Tom's Aunt Polly, she is -- and Mary, and the Widow Douglas is all told about in that book, which is mostly a true book, with some stretchers, "+
            "as I said before. Now the way that the book winds up is this: Tom and me found the money that the robbers hid in the cave, and it made us rich. "+
            "We got six thousand dollars apiece -- all gold. It was an awful sight of money when it was piled up. Well, Judge Thatcher he took it and put it "+
            "out at interest, and it fetched us a dollar a day apiece all the year round -- more than a body could tell what to do with. The Widow Douglas "+
            "she took me for her son, and allowed she would sivilize me; but it was rough living in the house all the time, considering how dismal regular "+
            "and decent the widow was in all her ways; and so when I couldn't stand it no longer I lit out. I got into my old rags and my sugar-hogshead "+
            "again, and was free and satisfied. But Tom Sawyer he hunted me up and said he was going to start a band of robbers, and I might join if I would "+
            "go back to the widow and be respectable. So I went back. The widow she cried over me, and called me a poor lost lamb, and she called me a lot of "+
            "other names, too, but she never meant no harm by it. She put me in them new clothes again, and I couldn't do nothing but sweat and sweat, and "+
            "feel all cramped up. Well, then, the old thing commenced again. The widow rung a bell for supper, and you had to come to time. When you got to "+
            "the table you couldn't go right to eating, but you had to wait for the widow to tuck down her head and grumble a little over the victuals, "+
            "though there warn't really anything the matter with them, -- that is, nothing only everything was cooked by itself. In a barrel of odds and "+
            "ends it is different; things get mixed up, and the juice kind of swaps around, and the things go better.";

        foreach ( string s in Segment ( msg , MAX_CHARS_TO_SHOW  ) )
          System.Console.WriteLine ( s ) ;


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

Written By
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

GeneralMy vote of 5 Pin
Lydia Gabriella16-Jul-14 11:55
Lydia Gabriella16-Jul-14 11:55 
GeneralRe: My vote of 5 Pin
PIEBALDconsult16-Jul-14 13:15
mvePIEBALDconsult16-Jul-14 13:15 
GeneralMy vote of 4 Pin
Jason Down19-Jun-14 3:37
Jason Down19-Jun-14 3:37 
QuestionA little too pithy for me Pin
B. Clay Shannon16-Jun-14 11:45
professionalB. Clay Shannon16-Jun-14 11:45 
AnswerRe: A little too pithy for me Pin
PIEBALDconsult16-Jun-14 12:12
mvePIEBALDconsult16-Jun-14 12:12 
GeneralRe: A little too pithy for me Pin
B. Clay Shannon16-Jun-14 12:28
professionalB. Clay Shannon16-Jun-14 12:28 
GeneralRe: A little too pithy for me Pin
PIEBALDconsult16-Jun-14 12:54
mvePIEBALDconsult16-Jun-14 12:54 
GeneralRe: A little too pithy for me Pin
B. Clay Shannon16-Jun-14 13:03
professionalB. Clay Shannon16-Jun-14 13:03 
GeneralRe: A little too pithy for me Pin
PIEBALDconsult16-Jun-14 13:13
mvePIEBALDconsult16-Jun-14 13:13 
GeneralRe: A little too pithy for me Pin
B. Clay Shannon16-Jun-14 13:27
professionalB. Clay Shannon16-Jun-14 13:27 
GeneralRe: A little too pithy for me Pin
PIEBALDconsult16-Jun-14 13:31
mvePIEBALDconsult16-Jun-14 13:31 
GeneralRe: A little too pithy for me Pin
B. Clay Shannon16-Jun-14 13:50
professionalB. Clay Shannon16-Jun-14 13:50 
GeneralRe: A little too pithy for me Pin
Pete O'Hanlon16-Jun-14 22:29
subeditorPete O'Hanlon16-Jun-14 22:29 
GeneralRe: A little too pithy for me Pin
PIEBALDconsult17-Jun-14 6:38
mvePIEBALDconsult17-Jun-14 6:38 

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