Files
file	strings/extract.hpp

Functions
std::unique_ptr< table >	cudf::strings::extract (strings_column_view const &input, regex_program const &prog, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Returns a table of strings columns where each column corresponds to the matching group specified in the given regex_program object. More...

std::unique_ptr< column >	cudf::strings::extract_all_record (strings_column_view const &input, regex_program const &prog, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Returns a lists column of strings where each string column row corresponds to the matching group specified in the given regex_program object. More...

Detailed Description

Function Documentation

◆ extract()

std::unique_ptr<table> cudf::strings::extract	(	strings_column_view const &	input,
		regex_program const &	prog,
		rmm::cuda_stream_view	stream = `cudf::get_default_stream()`,
		rmm::mr::device_memory_resource *	mr = `rmm::mr::get_current_device_resource()`
	)

Returns a table of strings columns where each column corresponds to the matching group specified in the given regex_program object.

All the strings for the first group will go in the first output column; the second group go in the second column and so on. Null entries are added to the columns in row i if the string at row i does not match.

Any null string entries return corresponding null output column entries.

Example:
s = ["a1", "b2", "c3"]
p = regex_program::create("([ab])(\\d)")
r = extract(s, p)
r is now [ ["a", "b", null],
           ["1", "2", null] ]

See the Regex Features page for details on patterns supported by this API.

Parameters

input	Strings instance for this operation
prog	Regex program instance
stream	CUDA stream used for device memory operations and kernel launches
mr	Device memory resource used to allocate the returned table's device memory

Returns: Columns of strings extracted from the input column

◆ extract_all_record()

std::unique_ptr<column> cudf::strings::extract_all_record	(	strings_column_view const &	input,
		regex_program const &	prog,
		rmm::cuda_stream_view	stream = `cudf::get_default_stream()`,
		rmm::mr::device_memory_resource *	mr = `rmm::mr::get_current_device_resource()`
	)

Returns a lists column of strings where each string column row corresponds to the matching group specified in the given regex_program object.

All the matching groups for the first row will go in the first row output column; the second row results will go into the second row output column and so on.

A null output row will result if the corresponding input string row does not match or that input row is null.

Example:
s = ["a1 b4", "b2", "c3 a5", "b", null]
p = regex_program::create("([ab])(\\d)")
r = extract_all_record(s, p)
r is now [ ["a", "1", "b", "4"],
           ["b", "2"],
           ["a", "5"],
           null,
           null ]