regular expressions

[oll3i]

i changed the import (4u) and i still get the highlights

[r035198x]

i changed the import (4u) and i still get the highlights

Remove

 import com.sun.org.apache.xalan.internal.xsltc.compiler.P attern;

Just use the standard Java API with import java.util.regex .*;

[oll3i]

it fixed the prob
but it doesnt replace a double in a string is this pattern correct for a double "[0-9]{0,2}\\.{0,1}[0-9]{0,2}"; and it reads in every second line not every line i checked it with system.out

private void write_to_file(String wplata_wyplata){
	try{
		
		
		
	BufferedReader in = new BufferedReader(new FileReader("konta//"+NumerKonta+".txt"));
    
    
	   
    String wczytane_dane="";
    String line = in.readLine();
  
    double sd= sr_dost;
    Double a1 = new Double(sd);
 
  while((line = in.readLine()) != null)   {   
	    wczytane_dane+=line;
    	line = in.readLine();
    	wczytane_dane+='\n';
    	
  }
  
  String patternStr = "[0-9]{0,2}\\.{0,1}[0-9]{0,2}";
  String replacementStr = a1.toString();;


  Pattern pattern = Pattern.compile(patternStr);


  Matcher matcher = pattern.matcher(wczytane_dane);
  String output = matcher.replaceFirst(replacementStr);
  System.out.println("output ze zmienionym balansem"+output); 
    
    in.close();
//here will be writing to a file
	  }catch (FileNotFoundException e) {
		    System.err.println("Nie ma takiego konta(File not found!)");
	  }catch (IOException e) {
	          System.err.println(e);
	  } catch (NumberFormatException e) {
	         System.out.println("NumberFormatException: " + e.getMessage());    
	  }catch (Exception ex)  {
    ex.printStackTrace();  }
	
	
}

[sicarie]

it fixed the prob
but it doesnt replace a double in a string is this pattern correct for a double "[0-9]{0,2}\\.{0,1}[0-9]{0,2}"; and it reads in every second line not every line i checked it with system.out

  while((line = in.readLine()) != null)   {   
	    wczytane_dane+=line;
    	line = in.readLine();   	
  }

You have two readlines - that's your 'every-other line' problem

As far as the regex goes - does the period need to be backwhacked?

I would think it would be something like [0-9]+.[0-9]+ just quick and rough, that's at least one 0-9, a period (not sure if this needs to be backwhacked or not), and at least one 0-9 digit, but could be any amount.

The way you have it, you pick up a number between 10 and 99 whose second digit is two or zero, and then three places after that. Is that what you want?

[oll3i]

thank u guys u r so helpful i dont know how i cd overlook that i had 2 readlines
... it finds and replaces the double now