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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