字符\0xhh 与具有十六进制值0xhh的字符匹配。
以下示例显示了字符匹配的用法。
package com.learnfk;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class CharactersDemo {
private static final String REGEX = "\x41";
private static final String INPUT = "abcAabc";
public static void main(String[] args) {
//create a pattern
Pattern pattern = Pattern.compile(REGEX);
</span><span class="com">//get a matcher object</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">if</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">//Prints the start index of the match.</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">
}
}
让我们编译并运行以上程序，这将产生以下输出-
Match String start(): 3
