Convert various input as pattern to a vector used in tokens_select, tokens_compound and kwic.
pattern2list(pattern, types, valuetype, case_insensitive,
concatenator = "_", remove_unigram = FALSE)
a character vector, list of character vectors, dictionary, collocations, or dfm. See pattern for details.
the type of pattern matching: "glob"
for
"glob"-style wildcard expressions; "regex"
for regular expressions;
or "fixed"
for exact matching. See valuetype for details.
ignore the case of dictionary values if TRUE
concatenator that join multi-word expression in tokens object
ignore single-word patterns if TRUE