程序工具之正则表达式测试工具<Java实现>

/**
* 在编译器控制台中使用的正则表达式测试器
* @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.");
}
}
}
}

/**
* 使用终端进行正则表达式测试的工具类，不能在编译器的控制台使用，可以
* 在DOS命令行下编译，运行使用
* @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");
}
}
}
}