java - 尝试理解单词边界

Question

我正在学习正则表达式，更具体地说是单词边界。我有一段代码，我认为应该返回至少一个匹配项，但事实并非如此。

我使用的代码有什么问题

public static void main(String[] args) 
{
    boolean matches;
    String [] various = {"Men of honour", "X Men", "Children of men", "Company men are great"}; 

    for(int i = 0; i < various.length; i++)
    {
        matches = Pattern.matches("\\bMen", various[i]);

        System.out.println("Does the string match the pattern? " + matches);
    }



}

输出如下

Does the string match the pattern? false
Does the string match the pattern? false
Does the string match the pattern? false
Does the string match the pattern? false

Answer 1

这不是因为单词边界。这是因为 .matches() 方法需要整个 字符串进行匹配。它无法提取子匹配。

你想要类似的东西

Pattern regex = Pattern.compile("\\bMen", Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
for(int i = 0; i < various.length; i++)
{
    Matcher regexMatcher = regex.matcher(various[i]);
    matches = regexMatcher.find();
    System.out.println("Does the string match the pattern? " + matches);
}