java 正则表达式例子， 查找字符串

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

public class Main {

public static void main(String[] args) throws Exception {
String str = "10.2368686986859686";
Pattern p = Pattern.compile("[\d]*[\.][\d]{2}"); // 小数保留两位小数
Matcher m = p.matcher(str);

// 查找相应的字符串
while (m.find()) {
String tmp = m.group();
if (!"".equals(tmp)) {
System.out.println(tmp);
}
}

// 判断是否匹配
System.out.println(m.matches());

str = "上山打老虎打不到";
p = Pattern.compile("老虎打不到");
m = p.matcher(str);

// 查找相应的字符串
while (m.find()) {
String tmp = m.group();
if (!"".equals(tmp)) {
System.out.println(tmp);
}
}
}
}