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  1. x = c("123 w. main ave., city, st", "mr. smith", "456 main st.")
  2. gsub("(?|(m)(rs?\\. )|( a)(ve\\.[\\s,])|( s)(t\\.(?:[\\s,]|$)))", "\\U\\1\\L\\2", x, perl=T)
Success #stdin #stdout 0.24s 60752KB
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[1] "123 w. main Ave., city, st" "Mr. smith"                 
[3] "456 main St."
https://ideone.com/fr669r
language:
R (R 3.5.2)
created:
7 years ago
visibility:
secret

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