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  1. gsub("\\b(?!(?:18|19|20)\\d{2}\\b(?!\\.\\d))\\d*\\.?\\d+\\b"," ", "I'd like to delete numbers like 84 and 0.5 but not dates like 2015", perl=T)
Success #stdin #stdout 0.45s 79168KB
stdin
Standard input is empty
stdout
[1] "I'd like to delete numbers like   and   but not dates like 2015"