解决方案
以下示例显示了如何在 Util.regex 类的 Patternname.matcher() 方法的帮助下从文件中打印与给定模式匹配的所有字符串。
import java.util.regex.*;
import java.io.*;
public class newfile {
public static void main(String[] args) throws IOException {
Pattern p1 = Pattern.compile("[A-Za-z][a-z]+");
BufferedReader r = new BufferedReader(new FileReader("os.java"));
String line;
while ((line = r.readLine()) != null) {
Matcher m = p1.matcher(line);
while (m.find()) {
System.out.println(m.group(0));
int s1 = m.start(0);
int e1 = m.end(0);
System.out.println(line.substring(s1, e1));
}
}
}
}