Add docs for run_regex and regex_gadget

R/run_regex.R

+#' Extract matched groups from regexp
+#'
+#' @param text Text to search
+#' @param pattern regexp
+#' @inheritParams base::regexec
 #' @export
 run_regex <- function(
   text,
   useBytes = FALSE,
   invert = FALSE
 ) {
+  # Use regex to get matches by group, gives start index and length
   m <- regexec(pattern, text, ignore.case, perl, fixed, useBytes)
-  x <- purrr::map(m, function(mi) list('idx' = purrr::map2(mi, attr(mi, "match.length"), ~ if(.x[1] != -1) c(.x, .x + .y - 1L))))
+  # Convert to start/end index
+  x <- purrr::map(m, function(mi) {
+    list(
+      'idx' = purrr::map2(mi, attr(mi, "match.length"),
+                          ~ if(.x[1] != -1) c(.x, .x + .y - 1L)))
+  })
+  # Store text and original regexc result with same hierarchy
   y <- purrr::map(text, ~ list(text = .))
   z <- purrr::map(regmatches(text, m), ~ list(m = .))
+  # Zip text, indexes and regexc match object lists
   purrr::map(seq_along(x), ~ list(text = y[[.]][[1]], idx = x[[.]][[1]], m = z[[.]][[1]]))
 }
 

man/regex_gadget.Rd

 \alias{regex_gadget}
 \title{regexplain gadget}
 \usage{
-regex_gadget(text = NULL)
+regex_gadget(text = NULL, start_page = if (is.null(text)) "Text" else
+  "Regex")
+}
+\arguments{
+\item{text}{Text to explore in gadget (editable using interface)}
+
+\item{start_page}{Open gadget to this tab, one of `"Text"`, `"Regex"`,
+`"Output"`, or `"Help"`}
 }
 \description{
 regexplain gadget

man/run_regex.Rd

+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/run_regex.R
+\name{run_regex}
+\alias{run_regex}
+\title{Extract matched groups from regexp}
+\usage{
+run_regex(text, pattern, ignore.case = FALSE, perl = FALSE, fixed = FALSE,
+  useBytes = FALSE, invert = FALSE)
+}
+\arguments{
+\item{text}{Text to search}
+
+\item{pattern}{regexp}
+
+\item{ignore.case}{if \code{FALSE}, the pattern matching is \emph{case
+      sensitive} and if \code{TRUE}, case is ignored during matching.}
+
+\item{perl}{logical.  Should Perl-compatible regexps be used?}
+
+\item{fixed}{logical.  If \code{TRUE}, \code{pattern} is a string to be
+    matched as is.  Overrides all conflicting arguments.}
+
+\item{useBytes}{logical.  If \code{TRUE} the matching is done
+    byte-by-byte rather than character-by-character.  See
+    \sQuote{Details}.}
+
+\item{invert}{logical.  If \code{TRUE} return indices or values for
+    elements that do \emph{not} match.}
+}
+\description{
+Extract matched groups from regexp
+}