这是我的输入文字
1. INTRODUCTION
This is a test document. This document lines can span multiple lines.
This is another line.
2. PROCESS
This is a test process. This is another line.
3. ANOTHER HEADING
...
我想在主标题1,2,3之间提取文本等等。我正在使用此正则表达式来匹配标题 - ^[ ]{0,2}?[0-9]{0,2}\\.(.*)$
如何在匹配项之间提取文本?