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  1. string <- "B04 + B02 - A10mB03"
  2. gsub("(B[0-1][0-9]|A[126]0mB[0-1][0-9])", "raster(\\1)", string)
  3. gsub("(\\w+)", "raster(\\1)", string)
Success #stdin #stdout 0.16s 176384KB
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[1] "raster(B04) + raster(B02) - raster(A10mB03)"
[1] "raster(B04) + raster(B02) - raster(A10mB03)"
https://ideone.com/ZAGc5X
language:
R (R 3.5.2)
created:
7 years ago
visibility:
secret

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