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POJava using regex to match a pattern for quizzes
 

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  1. POJava using regex to match a pattern for quizzes
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    <p>I am trying to do one of the 100 mega list projects. One of them is about a quiz maker that parses through a file of quiz questions, picks some of them out at random, creates a quiz and also grades quizzes. </p> <p>I am trying to do the part of simply loading in the quiz questions and parsing them out individually (i.e. 1 question and its multiple choice answers as an entity).</p> <p>The format of the quiz is as follows:</p> <pre><code>Intro to Computer Science 1. Which of the following accesses a variable in structure b? A. b-&gt;var B. b.var C. b-var D. b&gt;var 2. Which of the following accesses a variable in a pointer to a structure, *b? A. b-&gt;var B. b.var C. b-var D. b&gt;var 3. Which of the following is a properly defined struct? A. struct {int a;} B. struct a_struct {int a;} C. struct a_struct int a D. struct a_struct {int a;} 4. Which properly declares a variable of struct foo? A. struct foo B. foo var C. foo D. int foo </code></pre> <p>Of course there are many of these questions but they are all in the same format.Now I used BufferedReader to load in these questions into a string and am attempting to use regex to parse them. But I am unable to match on any specific part. Below is my code:</p> <pre><code> package myPackage; import java.io.*; import java.util.regex.Matcher; import java.util.regex.Pattern; public class QuizMaker { public static void main(String args[]) { String file = "myfile/QuizQuestions.txt"; StringBuilder quizLine = new StringBuilder(); String line = null; try { FileReader reader = new FileReader(file); BufferedReader buffreader = new BufferedReader(reader); while ((line = buffreader.readLine()) != null) { quizLine.append(line); quizLine.append("\n"); } buffreader.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } System.out.println(quizLine.toString()); Pattern pattern = Pattern.compile("^[0-9]{1}.+\\?"); Matcher matcher = pattern.matcher(quizLine.toString()); boolean didmatch = matcher.lookingAt(); System.out.println(didmatch); String mystring = quizLine.toString(); int start = matcher.start(); int end = matcher.end(); System.out.println(start + " " + end); char a = mystring.charAt(0); char b = mystring.charAt(6); System.out.println(a + " " + b); } } </code></pre> <p>At this point, I am simply trying to match on the questions themselves and leave the multiple choice answers till I solve this part. Is it due to my regex pattern being wrong? I tried to even match on a simple number itself and even that was failing (via "^[0-9]{1}"). </p> <p>Am I doing something completely wrong? One other question I had was that this simply was returning one match, not all of them. How exactly would you iterate through the string to find all matches? Any help would be appreciated.</p>
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    1. USPaul
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    1. COYou need to re-think your application design and how your data should be stored. Consider a database (sqlite for a lightweight soln) or an XML file or serialization over your current approach which is soon going to be a mess when you get to saving your test scores part. Just a single question with an option *"E. All of the above"* is enough to break your current approach of parsing line by line.
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      1. USRavi Thapliyal
    2. COYes, I do want to improve on that part but first I want to get the foundation down and start optimizing it. For now, I do not really have a lot of what ifs
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