group function

Group Regular Expressions

group - A wrapper for paste(collapse="|") that also searches the default and supplemental (regex_supplement) dictionaries for regular expressions before pasting them together with a pipe (|) separator.

group(..., left = "(", right = ")", dictionary = getOption("regex.library"))

Arguments

• left: A single length character vector to use as the left bound.
• right: A single length character vector to use as the right bound.
• dictionary: A dictionary of canned regular expressions to search within.
• ``: Regular expressions to add grouping parenthesis to a named expression from the default regular expression dictionary prefixed with single at (@) (e.g., "@rm_hash") or a regular expression from regex_supplement dictionary prefixed with an at (@) (e.g., "@time_12_hours").

Returns

Returns a single string of regular expressions with grouping parenthesis added.

Examples

group(LETTERS)
group(1)

(grouped <- group("(the|them)\\b", "@rm_zip"))
pastex(grouped)