hed.</td>
 </tr>
 <tr>
  <td>1</td>
  <td>Matched offset(1origin).</td>
 </tr>
</table>

<p>
The first matched pattern is stored in the system variable "matchstr".<br>
Group matched patterns of regular expressions are stored in 9 system variables from "groupmatchstr1" to "groupmatchstr9".<br>
Also, these system variables will not be changed when the pattern does not match.
</p>

<p>
When a user searches the multi-byte string like as Japanese, the user must configure the regular encoding by us