java.time.MatchResult.group()方法返回与上一个匹配项匹配的输入子序列。
String group() - 声明
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。
String group() - 异常
IllegalStateException -如果尚未尝试匹配，或者上一个匹配操作失败。
String group() - 示例
下面的示例显示java.time.MatchResult.group()方法的用法。
package com.learnfk;
import java.util.regex.MatchResult;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatchResultDemo {
private static final String REGEX = "(.)(\d+)(.)";
private static final String INPUT = "This is a sample Text, 1234, with numbers in between.";
public static void main(String[] args) {
//create a pattern
Pattern pattern = Pattern.compile(REGEX);
//get a matcher object
Matcher matcher = pattern.matcher(INPUT);
</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">//get the MatchResult</span><span class="pln">
</span><span class="typ">MatchResult</span><span class="pln"> result </span><span class="pun">=</span><span class="pln"> matcher</span><span class="pun">.</span><span class="pln">toMatchResult</span><span class="pun">();</span><span class="pln">
</span><span class="com">//Prints the input subsequence matched by the previous 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">"First Capturing Group - Match String: "</span><span class="pun">+</span><span class="pln">result</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 - Match String: This is a sample Text, 1234, with numbers in between.
