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public static void main(String[] args) {
String regex = "^java";
String input = "java sdfsdfd";
Pattern p = Pattern.compile(regex);
Matcher m = p.matcher(input);
System.out.println(m.matches());
}
Pattern.matches("\\d+","2223");//返回true
Pattern.matches("\\d+","2223aa");//返回false,需要匹配到所有字符串才能返回true,这里aa不能匹配到
Pattern.matches("\\d+","22bb23");//返回false,需要匹配到所有字符串才能返回true,这里bb不能匹配到