get_expression_size: Get pre-compiled regular expression program size

In re2r: RE2 Regular Expression

Description

Returns the program size, a very approximate measure of a regexp's "cost". Larger numbers are more expensive than smaller numbers.

Usage

get_expression_size(pattern, ...)

Arguments

pattern	a pre-compiled regular expression or a string
...	further arguments passed to re2

Value

a integer

Examples

get_expression_size(re2("1"))
get_expression_size(re2("(1)"))
get_expression_size(re2("(?:(?:(?:(?:(?:.)?){100})*)+)"))

Example output

[1] 5
[1] 7
[1] 1504

re2r documentation built on May 2, 2019, 12:35 p.m.