h2o: h2o.grep – R documentation

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h2o

h2o.grep

Search for matches to an argument pattern

Description

Searches for matches to argument 'pattern' within each element of a string column.

Usage

h2o.grep(
  pattern,
  x,
  ignore.case = FALSE,
  invert = FALSE,
  output.logical = FALSE
)

Arguments

`pattern`	A character string containing a regular expression.
`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

Details

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).

Value

H2OFrame holding the matching positions or a logical vector if 'output.logical' is enabled.

Examples

## 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),]

## End(Not run)

h2o

R Interface for the 'H2O' Scalable Machine Learning Platform

v3.32.1.2

Apache License (== 2.0)

Authors

Erin LeDell [aut, cre], Navdeep Gill [aut], Spencer Aiello [aut], Anqi Fu [aut], Arno Candel [aut], Cliff Click [aut], Tom Kraljevic [aut], Tomas Nykodym [aut], Patrick Aboyoun [aut], Michal Kurka [aut], Michal Malohlava [aut], Ludi Rehak [ctb], Eric Eckstrand [ctb], Brandon Hill [ctb], Sebastian Vidrio [ctb], Surekha Jadhawani [ctb], Amy Wang [ctb], Raymond Peck [ctb], Wendy Wong [ctb], Jan Gorecki [ctb], Matt Dowle [ctb], Yuan Tang [ctb], Lauren DiPerna [ctb], Tomas Fryda [ctb], H2O.ai [cph, fnd]

Initial release

2021-04-29