程序工具之正則表達式測試工具

/**
 * 在編譯器控制檯中使用的正則表達式測試器
 * @author Sking
 */
package regex;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

public class CompilerRegexTest {
	public static void main(String[] args) throws IOException {
		Pattern pattern = null;
		Matcher matcher = null;
		BufferedReader br = new BufferedReader(new InputStreamReader(
				new BufferedInputStream(System.in)));
		while (true) {
			try {
				System.out.print("Enter your regex: ");
				pattern = Pattern.compile(br.readLine());
				System.out.print("Enter input string to search: ");
				matcher = pattern.matcher(br.readLine());
			} catch (PatternSyntaxException pse) {
				System.out
						.println("There is a problem with the regular expression!");
				System.out.println("The pattern in question is: "
						+ pse.getPattern());
				System.out.println("The description is: "
						+ pse.getDescription());
				System.out.println("The message is: " + pse.getMessage());
				System.out.println("The index is: " + pse.getIndex());
				System.exit(0);
			}
			boolean found = false;
			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.");
			}
		}
	}
}

 

 

/**
 * 使用終端進行正則表達式測試的工具類，不能在編譯器的控制檯使用，可以
 * 在DOS命令行下編譯，運行使用
 * @author Sking
 */
package regex;

import java.io.Console;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ConsoleRegexTest {
	public static void main(String[] args) {
		Console console = System.console();
		if (console == null) {
			System.err.println("No console.");
			System.exit(1);
		}
		
		while (true) {
			Pattern pattern = Pattern.compile(console.readLine("%nEnter your regex: "));
			Matcher matcher = pattern.matcher(console.readLine("Enter input string to search: "));
			boolean found = false;
			while (matcher.find()) {
				console.format("I found the text \"%s\" starting at index %d " +
						"and ending at index %d.%n",
						matcher.group(), matcher.start(), matcher.end());
				found = true;
			}
			if (!found) {
				console.format("No match found.%n");
			}
		}
	}
}