java.time.Matcher.group()方法尝试查找与模式匹配的输入序列的下一个子序列。
String group() - 声明
以下是 java.time.Matcher.group()方法的声明。
public String group()
String group() - 返回值
与上一个匹配项匹配的(可能为空)子序列，为字符串形式。
IllegalStateException - 如果尚未尝试匹配，或者先前的匹配操作失败。
String group() - 示例
下面的示例显示java.time.Matcher.group()方法的用法。
package com.learnfk;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatcherDemo {
private static String REGEX = "(a*b)(foo)";
private static String INPUT = "aabfooaabfooabfoob";
private static String REPLACE = "-";
public static void main(String[] args) {
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">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">//在匹配的最后一个字符之后打印偏移量。</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">"First Capturing Group: "</span><span class="pun">+</span><span class="pln">matcher</span><span class="pun">.</span><span class="kwd">group</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-
First Capturing Group: aabfoo
