diff --git a/DESCRIPTION b/DESCRIPTION
index 8e1a25bb5..ecc13a7cd 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -29,7 +29,6 @@ Imports:
     magrittr (>= 2.0.0),
     purrr (>= 0.2.3),
     R.cache (>= 0.15.0),
-    rematch2 (>= 2.0.1),
     rlang (>= 0.1.1),
     rprojroot (>= 1.1),
     tibble (>= 1.4.2),
diff --git a/R/rules-spaces.R b/R/rules-spaces.R
index 76d5acfc5..21be47897 100644
--- a/R/rules-spaces.R
+++ b/R/rules-spaces.R
@@ -266,7 +266,7 @@ start_comments_with_space <- function(pd, force_one = FALSE) {
     return(pd)
   }
 
-  comments <- rematch2::re_match(
+  comments <- re_match(
     pd$text[is_comment],
     "^(?<prefix>#+['\\*]*)(?<space_after_prefix> *)(?<text>.*)$"
   )
diff --git a/R/utils.R b/R/utils.R
index f7ff3dc91..81bea559d 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -32,6 +32,32 @@ ensure_last_n_empty <- function(x, n = 1) {
   c(x, rep("", n))
 }
 
+#' @note Slightly simplified version of `rematch2::re_match()` (License: MIT).
+#' @keywords internal
+#' @noRd
+re_match <- function(text, pattern) {
+  stopifnot(is.character(pattern), length(pattern) == 1L, !is.na(pattern))
+  text <- as.character(text)
+  match <- regexpr(pattern, text, perl = TRUE)
+  start <- as.vector(match)
+  length <- attr(match, "match.length")
+  end <- start + length - 1L
+  matchstr <- substring(text, start, end)
+  matchstr[start == -1] <- NA_character_
+  res <- data.frame(stringsAsFactors = FALSE, .text = text, .match = matchstr)
+
+  gstart <- attr(match, "capture.start")
+  glength <- attr(match, "capture.length")
+  gend <- gstart + glength - 1L
+  groupstr <- substring(text, gstart, gend)
+  groupstr[gstart == -1] <- NA_character_
+  dim(groupstr) <- dim(gstart)
+  res <- cbind(groupstr, res, stringsAsFactors = FALSE)
+
+  names(res) <- c(attr(match, "capture.names"), ".text", ".match")
+  res
+}
+
 #' Replace the newline character with a line break
 #'
 #' @param text A character vector
diff --git a/tests/testthat/test-cache-interaction-roxygen-code-examples.R b/tests/testthat/test-cache-interaction-roxygen-code-examples.R
index 9a1248b84..bfbce2cd3 100644
--- a/tests/testthat/test-cache-interaction-roxygen-code-examples.R
+++ b/tests/testthat/test-cache-interaction-roxygen-code-examples.R
@@ -51,7 +51,7 @@ test_that("roxzgen code examples are written to cache as whole expressions bring
   # don't use full cache, only roxygen cache
   styled[1] <- "#' This is a nother text"
   second <- system.time(style_text(styled))
-  expect_gt(first["elapsed"], 5 * second["elapsed"])
+  expect_gt(first["elapsed"], 4 * second["elapsed"])
 })
 
 test_that("cache is deactivated at end of caching related testthat file", {