如何使用html标记或regex分割txt文件，以便将其保存为R中的独立txt文件?

I have the output of a LexisNexis batch download of news articles in both html and txt format. The file itself contains the headers, metadata, and body of several different news articles that I need to systematically separate and save as independent txt files. The head of the txt version looks like:I have the output of a LexisNexis batch downloa