diff --git a/data/helpers.d/string b/data/helpers.d/string
index fbf598738..13399ffe0 100644
--- a/data/helpers.d/string
+++ b/data/helpers.d/string
@@ -26,6 +26,27 @@ ynh_replace_string () {
 	local replace_string=$2
 	local workfile=$3
 
+	# Escape the delimiter if it's in the string.
+	match_string=${match_string//${delimit}/"\\${delimit}"}
+	replace_string=${replace_string//${delimit}/"\\${delimit}"}
+
+	sudo sed --in-place "s${delimit}${match_string}${delimit}${replace_string}${delimit}g" "$workfile"
+}
+
+# Substitute/replace a special string by another in a file
+#
+# usage: ynh_replace_special_string match_string replace_string target_file
+# | arg: match_string - String to be searched and replaced in the file
+# | arg: replace_string - String that will replace matches
+# | arg: target_file - File in which the string will be replaced.
+#
+# This helper will use ynh_replace_string, but as you can use special
+# characters, you can't use some regular expressions and sub-expressions.
+ynh_replace_special_string () {
+	local match_string=$1
+	local replace_string=$2
+	local workfile=$3
+
         # Escape any backslash to preserve them as simple backslash.
         match_string=${match_string//\\/"\\\\"}
         replace_string=${replace_string//\\/"\\\\"}
@@ -34,9 +55,5 @@ ynh_replace_string () {
         match_string=${match_string//&/"\&"}
         replace_string=${replace_string//&/"\&"}
 
-	# Escape the delimiter if it's in the string.
-	match_string=${match_string//${delimit}/"\\${delimit}"}
-	replace_string=${replace_string//${delimit}/"\\${delimit}"}
-
-	sudo sed --in-place "s${delimit}${match_string}${delimit}${replace_string}${delimit}g" "$workfile"
+	ynh_replace_string "$match_string" "$replace_string" "$workfile"
 }