diff --git a/crates/mdbook-core/src/utils/mod.rs b/crates/mdbook-core/src/utils/mod.rs
index 5e78d5e3..01bd2a6d 100644
--- a/crates/mdbook-core/src/utils/mod.rs
+++ b/crates/mdbook-core/src/utils/mod.rs
@@ -6,16 +6,11 @@ use tracing::error;
 
 pub mod fs;
 mod html;
-mod string;
 mod toml_ext;
 
 pub(crate) use self::toml_ext::TomlExt;
 
 pub use self::html::{escape_html, escape_html_attribute};
-pub use self::string::{
-    take_anchored_lines, take_lines, take_rustdoc_include_anchored_lines,
-    take_rustdoc_include_lines,
-};
 
 /// Defines a `static` with a [`regex::Regex`].
 #[macro_export]
diff --git a/crates/mdbook-driver/src/builtin_preprocessors/links.rs b/crates/mdbook-driver/src/builtin_preprocessors/links.rs
index a15fea8b..787b7745 100644
--- a/crates/mdbook-driver/src/builtin_preprocessors/links.rs
+++ b/crates/mdbook-driver/src/builtin_preprocessors/links.rs
@@ -1,10 +1,10 @@
-use anyhow::{Context, Result};
-use mdbook_core::book::{Book, BookItem};
-use mdbook_core::static_regex;
-use mdbook_core::utils::{
+use self::take_lines::{
     take_anchored_lines, take_lines, take_rustdoc_include_anchored_lines,
     take_rustdoc_include_lines,
 };
+use anyhow::{Context, Result};
+use mdbook_core::book::{Book, BookItem};
+use mdbook_core::static_regex;
 use mdbook_preprocessor::{Preprocessor, PreprocessorContext};
 use regex::{CaptureMatches, Captures};
 use std::fs;
@@ -12,6 +12,8 @@ use std::ops::{Bound, Range, RangeBounds, RangeFrom, RangeFull, RangeTo};
 use std::path::{Path, PathBuf};
 use tracing::{error, warn};
 
+mod take_lines;
+
 const ESCAPE_CHAR: char = '\\';
 const MAX_LINK_NESTED_DEPTH: usize = 10;
 
diff --git a/crates/mdbook-core/src/utils/string.rs b/crates/mdbook-driver/src/builtin_preprocessors/links/take_lines.rs
similarity index 96%
rename from crates/mdbook-core/src/utils/string.rs
rename to crates/mdbook-driver/src/builtin_preprocessors/links/take_lines.rs
index 9f75dfaa..e884a994 100644
--- a/crates/mdbook-core/src/utils/string.rs
+++ b/crates/mdbook-driver/src/builtin_preprocessors/links/take_lines.rs
@@ -1,9 +1,9 @@
-use crate::static_regex;
+use mdbook_core::static_regex;
 use std::ops::Bound::{Excluded, Included, Unbounded};
 use std::ops::RangeBounds;
 
 /// Take a range of lines from a string.
-pub fn take_lines<R: RangeBounds<usize>>(s: &str, range: R) -> String {
+pub(super) fn take_lines<R: RangeBounds<usize>>(s: &str, range: R) -> String {
     let start = match range.start_bound() {
         Excluded(&n) => n + 1,
         Included(&n) => n,
@@ -28,7 +28,7 @@ static_regex!(ANCHOR_END, r"ANCHOR_END:\s*(?P<anchor_name>[\w_-]+)");
 
 /// Take anchored lines from a string.
 /// Lines containing anchor are ignored.
-pub fn take_anchored_lines(s: &str, anchor: &str) -> String {
+pub(super) fn take_anchored_lines(s: &str, anchor: &str) -> String {
     let mut retained = Vec::<&str>::new();
     let mut anchor_found = false;
 
@@ -60,7 +60,7 @@ pub fn take_anchored_lines(s: &str, anchor: &str) -> String {
 /// For any lines not in the range, include them but use `#` at the beginning. This will hide the
 /// lines from initial display but include them when expanding the code snippet or testing with
 /// rustdoc.
-pub fn take_rustdoc_include_lines<R: RangeBounds<usize>>(s: &str, range: R) -> String {
+pub(super) fn take_rustdoc_include_lines<R: RangeBounds<usize>>(s: &str, range: R) -> String {
     let mut output = String::with_capacity(s.len());
 
     for (index, line) in s.lines().enumerate() {
@@ -78,7 +78,7 @@ pub fn take_rustdoc_include_lines<R: RangeBounds<usize>>(s: &str, range: R) -> S
 /// For any lines not between the anchors, include them but use `#` at the beginning. This will
 /// hide the lines from initial display but include them when expanding the code snippet or testing
 /// with rustdoc.
-pub fn take_rustdoc_include_anchored_lines(s: &str, anchor: &str) -> String {
+pub(super) fn take_rustdoc_include_anchored_lines(s: &str, anchor: &str) -> String {
     let mut output = String::with_capacity(s.len());
     let mut within_anchored_section = false;