The 'searchable' package provides flexibile methods for subseting
object by matching objects names using case (in)sensitivity, regular or fixed expressions. Searches uses the standard '[' operator and allows specification of default search behavior to either the search target (named object) and/or the search pattern.
It was designed to make flexible, high performance dictionary and thesaurus structures.
Features of this package are:
'stringr/i'-style match modifiers for matching names by case (in)sensitivity, regular expressions or fixed expression.
Match modification applied to either/both the pattern and target.
The [ operatore overloaded to provide R-like functionality.
Search behavior defaults to base R behaviors.
library(devtools)
install_github( "decisionpatterns/searchable" )
# OR
install.packages('searchable') library(searchable)
library(magrittr)
# ATOMIC VECTORS:
v <- c( a=1, b=2, B=3, c=4, c2=5 )
sv <- searchable(v)
# EXTRACT:
sv$a
sv[['a']]
sv[[ ignore.case('A') ]]
sv[ ignore.case('b') ]
sv[ perl('c') ]
sv[ fixed('c') ]
# REPLACEMENT:
sv$a <- "first"
sv[['a']] <- "1st"
sv[[ perl('c.') ]] <- "third"
sv[ perl('c.?') ] <- "3rd"
# MODIFIERS TO SEARCH TARGET/OBJECT
sv <- searchable(v, ignore.case )
sv$A
sv['b']
sv['B']
# RECURSIVE LISTS:
l <- list( a=1, b=2, c=3 )
sl <- searchable(l)
sl[["b"]]
sl[[ ignore.case("B") ]]
# USE WITH MAGRITTR
sl[ "B" %>% ignore.case ]
"b" %>% sl[[.]]
"B" %>% ignore.case %>% sl[[ . ]]