字符类\p {Blank} 匹配空格或制表符。
p{Blank} - 示例
下面的示例显示Posix字符类匹配的用法。
package com.learnfk;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PosixCharacterClassDemo {
private static final String REGEX = "\p{Blank}";
private static final String INPUT = "Bb12\tc!";
public static void main(String[] args) {
//创建一个模式
Pattern pattern = Pattern.compile(REGEX);
</span><span class="com">//获取匹配器对象</span><span class="pln">
</span><span class="typ">Matcher</span><span class="pln"> matcher </span><span class="pun">=</span><span class="pln"> pattern</span><span class="pun">.</span><span class="pln">matcher</span><span class="pun">(</span><span class="pln">INPUT</span><span class="pun">);</span><span class="pln">
</span><span class="kwd">while</span><span class="pun">(</span><span class="pln">matcher</span><span class="pun">.</span><span class="pln">find</span><span class="pun">())</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
</span><span class="com">//打印匹配的开始索引。</span><span class="pln">
</span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Match String start(): "</span><span class="pun">+</span><span class="pln">matcher</span><span class="pun">.</span><span class="pln">start</span><span class="pun">());</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
}
}
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(): 4
