fork(1) download 
  1. x = ">P04259 SWISS-PROT:P04259 Tax_Id=9606 Gene_Symbol=KRT6B Keratin, type II cytoskeletal 6B"
  2. gsub("^(?:>.*?(?:ENSEMBL:|SWISS-PROT:|TREMBL:))([A-Z0-9.-]+)(?:.*?Gene_Symbol=(\\S+)|\\s|;\\S+ |\\|\\S+)(.*?)(?:;>.*|$)", "\\1", x, perl = TRUE)
  3.  
Success #stdin #stdout 0.45s 79168KB
comments (?)
stdin 
Standard input is empty
stdout 
[1] "P04259"
https://ideone.com/fHHjZ2
language:
R (R 3.5.2)
created:
9 years ago
visibility:
secret

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