A small R package to deal with regular expressions, mainly in dictionaries. This is used in multidictR and popdictR.
This package requires the stringr package and can be installed from within R using devtools:
library(devtools)
# Install the socmedhelpeRs package from GitHub
devtools::install_github("jogrue/regexhelpeR")# Loading the package
library("regexhelpeR")
# Some (greedy and one mixed) regular expressions
pat <- c("politic(.*)", "boy(s)?", "part(y|i)(.+)", "(.*)mixed(.*?)")
# Switch between lazy and greedy patterns
pat_switched <- switch_regex_greedy_lazy(pat)
pat
# [1] "politic(.*)" "boy(s)?" "part(y|i)(.+)" "(.*)mixed(.*?)"
pat_switched
# [1] "politic(.*?)" "boy(s)??" "part(y|i)(.+?)" "(.*?)mixed(.*)"
# Turn all greedy patterns to lazy patterns
pat_lazy <- make_all_regex_lazy(pat)
pat_lazy
# [1] "politic(.*?)" "boy(s)??" "part(y|i)(.+?)" "(.*?)mixed(.*?)"
# Turn all lazy patterns to greedy patterns
pat_greedy <- make_all_regex_greedy(pat_lazy)
pat_greedy
#[1] "politic(.*)" "boy(s)?" "part(y|i)(.+)" "(.*)mixed(.*)"
# Optimizations for running the dictionaries
pat_optim <- optimize_regex_patterns(pat_greedy)
pat_greedy
# [1] "politic(.*)" "boy(s)?" "part(y|i)(.+)" "(.*)mixed(.*)"
pat_optim
# [1] "\\bpolitic" "\\bboy(s)?\\b" "\\bpart(y|i)(.+)\\b" "mixed" Gründl, J. (2020). Populist ideas on social media: A dictionary-based measurement of populist communication. New Media & Society. Advance online publication. https://doi.org/10.1177/1461444820976970
Gründl, J. (2020). regexhelpeR (R package). https://github.com/jogrue/regexhelpeR