java.time.MatchResult.start()方法返回匹配的开始索引。
int start() - 声明
int start()
int start() - 返回值
匹配的第一个字符的索引。
int start() - 异常
IllegalStateException -如果尚未尝试匹配，或者先前的匹配操作失败。
int start() - 示例
下面的示例显示java.time.MatchResult.start()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);
</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">//get the MatchResultObject</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 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">"First Capturing Group - Match String start(): "</span><span class="pun">+</span><span class="pln">result</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-
First Capturing Group - Match String start(): 0
