Searches for matches to argument `pattern` within each element of a string column.
h2o.grep( pattern, x, ignore.case = FALSE, invert = FALSE, output.logical = FALSE )
pattern | A character string containing a regular expression. |
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x | An H2O frame that wraps a single string column. |
ignore.case | If TRUE case is ignored during matching. |
invert | Identify elements that do not match the pattern. |
output.logical | If TRUE returns logical vector of indicators instead of list of matching positions |
H2OFrame holding the matching positions or a logical vector if `output.logical` is enabled.
This function has similar semantics as R's native grep function and it supports a subset of its parameters. Default behavior is to return indices of the elements matching the pattern. Parameter `output.logical` can be used to return a logical vector indicating if the element matches the pattern (1) or not (0).
# NOT RUN { library(h2o) h2o.init() addresses <- as.h2o(c("2307", "Leghorn St", "Mountain View", "CA", "94043")) zip_codes <- addresses[h2o.grep("[0-9]{5}", addresses, output.logical = TRUE),] # }