fork download
copy 
  1. chars <- c("check24  smavey  dr klein", "smava", "check24, interhyp", 
  2.   "verivox  check24  dr. klein", "dr. klein", NA, "dr. weber", 
  3.   "dr. klein,", NA, "check24  verivox", "Name1, Name2 Name3", "Dr. Name1 Name2 Name3", "AAA AAAA AAAA AAAA")
  4.  
  5. gsub('(?<=\\w{4})\\h+(?=\\w{4})', '_', chars, perl=TRUE)
Success #stdin #stdout 0.2s 39528KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
 [1] "check24_smavey  dr klein"   "smava"                     
 [3] "check24, interhyp"          "verivox_check24  dr. klein"
 [5] "dr. klein"                  NA                          
 [7] "dr. weber"                  "dr. klein,"                
 [9] NA                           "check24_verivox"           
[11] "Name1, Name2_Name3"         "Dr. Name1_Name2_Name3"     
[13] "AAA AAAA_AAAA_AAAA"
https://ideone.com/qguILq
language:
R (R 3.5.2)
created:
5 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!