通过匹配字符串模式从字符串中提取单词

Question

通过比较java中的字符串模式，有没有简单的方法来提取单词。

input
pattern: what do you know about <topic1> and <topic2>
string : what do you know about cricket and football

output
cricket, football

Answer 1

Pattern p = Pattern.compile("what do you know about (.*) and (.*)"; // in line you create a pattern to which you are checking other Strings
Matcher m = p.matcher(stringToCompare); // in this line you decide that you want to check stringToCompare if it matches the given pattern
while(m.find()) { // this loop prints only captured groups if match was found
    System.out.println(m.group(1)) +" " + m.group(2));
}

在Pattern中有捕获组（在括号中），它们的顺序从1开始，从左到右计算它们的出现次数。在while循环中，您决定只将这些组打印到控制台。

在以下行中，您不需要传递对变量的引用，您可能还希望将String字面值传递给Matcher而不是引用String变量：< / p>

Matcher m = p.matcher("what do you know about cricket and football");

以上行也可以。