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Regular expression

Chiranjeevi Kanthraj
Ranch Hand

Joined: Feb 18, 2008
Posts: 290

Hi i need a regular expression to parse the String which is entered from text box

like "-40.23-50.45,-30,40,<30,>50"
where i should consider "," is different set of values
and
"-40.23-50.45" means i have to split it as -40.23 to 50.45
"-30" as -30
"40" as 40
"<30" means values less then 30
">50" means values greater then 50

Thanks in advance

-Chiru
pete stein
Bartender

Joined: Feb 23, 2007
Posts: 1561
This doesn't have anything to do with Swing (yes, you get the String from a GUI text field, but that really doesn't matter in the String's parsing), and I'm going to ask the moderators to move this to one of the main Java forums. My question for you is: what have you tried so far and in what way does your current code not work?

Best of luck.
Chiranjeevi Kanthraj
Ranch Hand

Joined: Feb 18, 2008
Posts: 290

right now i split the string from ","
and split according to "-"

i'm facing problem if -ve value comes
Maneesh Godbole
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Joined: Jul 26, 2007
Posts: 10535
    
    9

Agree with Pete.
Moving.


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Vijitha Kumara
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Joined: Mar 24, 2008
Posts: 3860

"-40.23-50.45" means i have to split it as -40.23 to 50.45


Is it 40.23 to 50.45 ? Both have - in front of them. BTW, show us what you have done already and what problem you are having now ?


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Chiranjeevi Kanthraj
Ranch Hand

Joined: Feb 18, 2008
Posts: 290



In this if we give -40-50 means -40 is the min and 50 is the max for which is not working
Jesper de Jong
Java Cowboy
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Joined: Aug 16, 2005
Posts: 14435
    
  23

The split method in line 14 of your code probably does not do what you think it does:

String[] si=s.split("-",2);

It looks like you think that this looks from position 2 in the string onward. But this is not what it does. Look it up in the API documentation:
public String[] split(String regex, int limit)

Splits this string around matches of the given regular expression.
The array returned by this method contains each substring of this string that is terminated by another substring that matches the given expression or is terminated by the end of the string. The substrings in the array are in the order in which they occur in this string. If the expression does not match any part of the input then the resulting array has just one element, namely this string.

The limit parameter controls the number of times the pattern is applied and therefore affects the length of the resulting array. If the limit n is greater than zero then the pattern will be applied at most n - 1 times, the array's length will be no greater than n, and the array's last entry will contain all input beyond the last matched delimiter. If n is non-positive then the pattern will be applied as many times as possible and the array can have any length. If n is zero then the pattern will be applied as many times as possible, the array can have any length, and trailing empty strings will be discarded.


You'd see that if the input is "-40-50", the call to split in line 14 results in two strings: "" and "40-50" - because it has done the split one time, around the first "-".

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salvin francis
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Joined: Jan 12, 2009
Posts: 928

refer to the interpreter pattern interpreter pattern java


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Chiranjeevi Kanthraj
Ranch Hand

Joined: Feb 18, 2008
Posts: 290

Thanks for the reply

i got the solution


Where rawdata is the input string


Piet Verdriet
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Joined: Feb 25, 2006
Posts: 266
Chiranjeevi Kanthraj wrote:Thanks for the reply

i got the solution


Where rawdata is the input string




There is no need to recompile the pattern each time. You can put it above the for statement.
Chiranjeevi Kanthraj
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Joined: Feb 18, 2008
Posts: 290

Ya!

Thanks for suggestion
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: Regular expression