边界匹配器 [\B] 匹配非单词边界。
以下示例显示了边界匹配器的用法。
链接:https://www.learnfk.comhttps://www.learnfk.com/javaregex/javaregex-boundary-matcher-nonword.html
来源:LearnFk无涯教程网
package com.learnfk; import java.util.regex.Matcher; import java.util.regex.Pattern; public class BoundaryMatcherDemo { private static final String REGEX = "\\B"; private static final String INPUT = "Welcome to LearnFk.COM"; public static void main(String[] args) { //创建一个模式 Pattern pattern = Pattern.compile(REGEX); //获取匹配对象 Matcher matcher = pattern.matcher(INPUT); while(matcher.find()) { //打印匹配的起始索引。 System.out.println("Match String start(): "+matcher.start()); } } }
让无涯教程编译并运行以上程序,这将产生以下输出-
Match String start(): 1 Match String start(): 2 Match String start(): 3 Match String start(): 4 Match String start(): 5 Match String start(): 6 Match String start(): 9 Match String start(): 12 Match String start(): 13 Match String start(): 14 Match String start(): 15 Match String start(): 16 Match String start(): 17 Match String start(): 18 Match String start(): 19 Match String start(): 20 Match String start(): 21 Match String start(): 22 Match String start(): 23 Match String start(): 24 Match String start(): 27 Match String start(): 28
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