Java Regular Expression : File and Find : Lookup « Regular Expressions « Java






Java Regular Expression : File and Find

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import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public final class RegexTestHarness {

  private static String REGEX;

  private static String INPUT;

  private static BufferedReader br;

  private static Pattern pattern;

  private static Matcher matcher;

  private static boolean found;

  public static void main(String[] argv) {
    initResources();
    processTest();
    closeResources();
  }

  private static void initResources() {
    try {
      br = new BufferedReader(new FileReader("regex.txt"));
    } catch (FileNotFoundException fnfe) {
      System.out
          .println("Cannot locate input file! " + fnfe.getMessage());
      System.exit(0);
    }
    try {
      REGEX = br.readLine();
      INPUT = br.readLine();
    } catch (IOException ioe) {
    }

    pattern = Pattern.compile(REGEX);
    matcher = pattern.matcher(INPUT);

    System.out.println("Current REGEX is: " + REGEX);
    System.out.println("Current INPUT is: " + INPUT);
  }

  private static void processTest() {
    while (matcher.find()) {
      System.out.println("I found the text \"" + matcher.group()
          + "\" starting at index " + matcher.start()
          + " and ending at index " + matcher.end() + ".");
      found = true;
    }

    if (!found) {
      System.out.println("No match found.");
    }
  }

  private static void closeResources() {
    try {
      br.close();
    } catch (IOException ioe) {
    }
  }
}


           
       








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