Re: Remove multiple blanks in a string? - C# Discussion Boards

31-Jan-05 1:00

Hi!

I need a good method to remove multiple blanks from a string and replace them with a single blank. For example: "This is a string" -> "This is a string". The method I am using now works fine but is a bit resource demanding (about 80% of the thread). Hmmm | :|

public static string RemoveMb (string strIn) // Remove multiple blanks
{
string search = @"\s+";
string replace = @" ";
strIn = Regex.Replace(strIn, search, replace);
return strIn;
}

Anyone know of a better method? Rose | [Rose]

Best regards,
Daniel

lainoo31-Jan-05 1:58

lainoo

31-Jan-05 1:58

public string st(string st)
{
for(string st1="";st!=st1;st1=st,st=st1.Replace(" "," "));
return st;
}

Sorry ...

Syntaxo31-Jan-05 2:36

31-Jan-05 2:36

Hmm, I took a quick look at and even tested that code. Does it do anything good at all? Confused | :confused:

Doesn't it just replace all blanks (even the multiple ones) with a "new" blank?

Best regards,
Daniel

mav.northwind31-Jan-05 2:49

mav.northwind

31-Jan-05 2:49

Come on, take a look at the proposal and use your brain.
It's not so hard to find out that the first string in Replace has to consist of two blanks and that they're rendered as one blank because lainoo didn't quote his code in <pre>.

mav

Syntaxo31-Jan-05 3:07

31-Jan-05 3:07

Well, I guess it wasn't that hard to find out so I'll accept the heat for that one. Blush | :O

But it still doesn't work since the "multiple blanks" in my strings can consist of more than just two blanks.

Best regards,
Daniel

mav.northwind31-Jan-05 5:07

mav.northwind

31-Jan-05 5:07

Did you try the code after correcting it?
It's supposed to replace double spaces with single spaces until the string doesn't change anymore.
Each run should halve the double spaces in your input string until there are only single spaces.

mav

Syntaxo31-Jan-05 5:27

31-Jan-05 5:27

Ahh! Tested it again now more thoroughly. My deepest apologies to both lainoo and You mav, the code works it just don't apply to tabs (\t) which the regexp "\s" seem to do. Blush | :O

I got confused when I saw the big gaps in my string but when looked at closely they are mixed blanks and tabs. The method works way faster than the regular expression I used, now I need to find a way to include tabs.

I guess I'll have to go with a double run to first remove all tabs?

Thanks a lot!

Best regards,
Daniel

mav.northwind31-Jan-05 6:15

mav.northwind

31-Jan-05 6:15

Nice to see you were persistent enough to actually try Smile | :)

I think a simple call to

st = st.Replace("\t"," ");

before the loop does the trick.
You don't have to care about double (or more) tabs, since the resulting double (or more) blanks are taken care of in the loop anyway.

mav

Corinna John31-Jan-05 2:51

Corinna John

31-Jan-05 2:51

//split string
String[] parts = strIn.split(' ');

//re-build string
StringBuilder newString = new StringBuilder();
for(int n=0; n<parts.Length; n++){
  if(parts[n].Length > 0){
     newString.Append(parts[n]);
     newString.Append(" ");
  }
}

//remove trailing space and return
newString.Remove(newString.Length-1, 1);
return newString.ToString();

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Syntaxo31-Jan-05 3:42

31-Jan-05 3:42

Can't get that to work since it seems to split directly after the first blank found and leaving the remaining blanks in the string-array items Cry | :((

Best regards,
Daniel

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leppie31-Jan-05 7:32

leppie

31-Jan-05 7:32

Create a static instance of the Regex object with Compiled flags, and reuse that object to do the replace. Much of the processing is used when the method u are calling is being constructed internally.

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connect to mySQL

Jassim Rahma31-Jan-05 0:57

Jassim Rahma

31-Jan-05 0:57

Hi,

How can I directlly connect to mySQL server from C# without an ODBC drive? connecting through ODBC means I have to include mySQL Connecter/ODBC in my distribution media.. I want to only distibute my application..

Re: connect to mySQL

Colin Angus Mackay31-Jan-05 5:16

Colin Angus Mackay

31-Jan-05 5:16

jrahma wrote:
How can I directlly connect to mySQL server from C# without an ODBC drive?

Use the MySql ADO.NET connector: http://www.mysql.com/products/connector/net/[^]

Displaying Interactive Diagrams

Mridang Agarwalla31-Jan-05 0:14

Mridang Agarwalla

31-Jan-05 0:14

hello,
i have been told to develop an application that has a country map displayed along with all its states. now whenever i move my mouse over a state, the stae gets highlighted and when i click on a particular state an event gets trigerred and some data is displayed on the map. what tool should i do to accomplish this.

see this example
http://www.lq.com/lq/map/index.jsp[^]

DavieB31-Jan-05 4:50

DavieB

31-Jan-05 4:50

I would say whatever tool best suits your current skills. Are you a programmer?

Check out Mappoint http://www.microsoft.com/mappoint/default.mspx although this maybe much more than you need.

Steve Maier31-Jan-05 10:43

Steve Maier

31-Jan-05 10:43

Well the link that you gave as an example used Macromedia Flash to do the animation and the mouseover type of information. You could use an html map function to create a map on an image,it might allow you to put a mouseover type of event in, but it has been a while since I have done that. You could make evach state into an image in the application and then just use the custom drawing routines on CP to draw them for each state.

Is this a web app or a Windows App?

Steve Maier, MCSD MCAD

Mridang Agarwalla1-Feb-05 19:55

Mridang Agarwalla

1-Feb-05 19:55

its a windows application. I couldnt figure out what you meant to say above so could you please elaborate what you meant...