Java:String.contains匹配完全匹配的单词 [英] Java: String.contains matches exact word

问题描述

在Java中

String term = "search engines"
String subterm_1 = "engine"
String subterm_2 = "engines"

如果我执行 term.contains(subterm_1)，它将返回 true .我不要我希望 subterm 与 term

If I do term.contains(subterm_1) it returns true. I don't want that. I want the subterm to exactly match one of the words in term

因此，类似 term.contains(subterm_1)的操作返回 false 和 term.contains(subterm_2)的操作返回 true

Therefore something like term.contains(subterm_1) returns false and term.contains(subterm_2) returns true

推荐答案

\ b匹配单词字符为[a-zA-Z0-9_]的单词边界.

\b Matches a word boundary where a word character is [a-zA-Z0-9_].

这应该对您有用，并且您可以轻松地重用此方法.

This should work for you, and you could easily reuse this method.

public class testMatcher {
public static void main(String[] args){

    String source1="search engines";
    String source2="search engine";
    String subterm_1 = "engines";
    String subterm_2 = "engine";

    System.out.println(isContain(source1,subterm_1));
    System.out.println(isContain(source2,subterm_1));
    System.out.println(isContain(source1,subterm_2));
    System.out.println(isContain(source2,subterm_2));

}

    private static boolean isContain(String source, String subItem){
         String pattern = "\\b"+subItem+"\\b";
         Pattern p=Pattern.compile(pattern);
         Matcher m=p.matcher(source);
         return m.find();
    }

}

输出:

true
false
false
true

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