Parse File

[dcusick]

What's up all? I have a quick question for anyone out there... I have a file that i have to run through and parse... I want to extract all values of the format r00, where 00 are any numbers. The problem is that I could have r1, or r11. So I never know if there are two digits in the string, or just one. I have the code written that extracts the contents of the file and places them in a string buffer. I can run through each line, character by character, but I just don't know where to go after that.. I think it's pretty safe to say that if an 'r' is encountered and a number follows it, then I want it... Any suggestions?

 

[sedj]

This is a bit cra*, and there are probably much better algorithms out there, but ...

BufferdReader br = new BufferedReader(new FileReader(file));
String line = "";
while ((line = br.readLine()) != null) {
  // miss out the 'r' but get the rest
  int i = Integer.parseInt(line.substring(1, line.length());
}

 

[dcusick]

Thanks for the reply, but that didn't seem to work for me... I kept getting NumberFormatExceptions being thrown everywhere... I figured out a way to do it.. It's probably exhaustive, but it definitely works, so that's the most important part... Basically, if I find an 'r', I just grab the next two characters. If they're both digits, I append them to the r, else I only append one of them.

	for(int i=0; i<strLine.length(); i++) {
	    if (strLine.substring(i,i+1).equals("r")) {
		nextChar = strLine.charAt(i+1);

		if ((i+2) >= strLine.length()) {
		    nexxtChar = 'z';
		} else {
		    nexxtChar = strLine.charAt(i+2);
		}
		if (Character.isDigit(nextChar)) {
		    if (Character.isDigit(nexxtChar)) {
			regNumb = strLine.substring(i+1,i+3);
		    } else {
			regNumb = strLine.substring(i+1,i+2);
		    }
		    regVals.add((String) strLine.substring(i,i+1) + regNumb);
		}	
	    }
	}