如何在一行中的单词之间搜索多个空格的出现次数
@H_403_6@1. this is a line containing 2 spaces 2. this is a line containing 3 spaces 3. this is a line containing multiple spaces first second three four
以上所有都是此正则表达式的有效匹配.我应该使用什么样的正则表达式?