如何在R中搜索和隔离FASTA格式化文本的属性

I have a FASTA formatted file, which is essentially a special text file, containing many entries, one of which looks like below, which I have assigned by the name "FASTA" in R. The original file was red and formated as seen below using seqinr package in R.I have a FASTA formatted file, which is essenti