如何将每行的前四个字符复制到同一行的末尾?
给定一系列类似于以下内容的行: 2001 "Some Kind of Title," Author's Name, Publication Name, 1 Mar. 2002 "Some Kind of Title," Author's Name, Publication Name, 12 Oct. 2003 "Some Kind of Title," Author's Name, Publication Name, 8 Apr. 2004 "Some Kind of Title," Author's Name, Publication Name, 3 Jun. 有没有办法我可以抓住前四个字符(年份),然后将它们复制到行的末尾,使其看起来像这样: 2001 "Some Kind of …