diff --git a/data/helpers.d/string b/data/helpers.d/string
index f708b31b1..c13497f9f 100644
--- a/data/helpers.d/string
+++ b/data/helpers.d/string
@@ -1,59 +1,74 @@
 # Generate a random string
 #
-# example: pwd=$(ynh_string_random 8)
+# example: pwd=$(ynh_string_random --length=8)
 #
-# usage: ynh_string_random [length]
-# | arg: length - the string length to generate (default: 24)
+# usage: ynh_string_random [--length=string_length]
+# | arg: -l, --length - the string length to generate (default: 24)
 ynh_string_random() {
+    # Declare an array to define the options of this helper.
+    declare -Ar args_array=( [l]=length= )
+    local length
+    # Manage arguments with getopts
+    ynh_handle_getopts_args "$@"
+    length=${length:-24}
+
     dd if=/dev/urandom bs=1 count=200 2> /dev/null \
       | tr -c -d 'A-Za-z0-9' \
-      | sed -n 's/\(.\{'"${1:-24}"'\}\).*/\1/p'
+      | sed -n 's/\(.\{'"$length"'\}\).*/\1/p'
 }
 
 # Substitute/replace a string (or expression) by another in a file
 #
 # usage: ynh_replace_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.
+# | arg: -m, --match_string - String to be searched and replaced in the file
+# | arg: -r, --replace_string - String that will replace matches
+# | arg: -f, --target_file - File in which the string will be replaced.
 #
 # As this helper is based on sed command, regular expressions and
 # references to sub-expressions can be used
 # (see sed manual page for more information)
 ynh_replace_string () {
+	# Declare an array to define the options of this helper.
+	declare -Ar args_array=( [m]=match_string= [r]=replace_string= [f]=target_file= )
+	local match_string
+	local replace_string
+	local target_file
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+
 	local delimit=@
-	local match_string=$1
-	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"
+	sudo sed --in-place "s${delimit}${match_string}${delimit}${replace_string}${delimit}g" "$target_file"
 }
 
 # 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.
+# | arg: -m, --match_string - String to be searched and replaced in the file
+# | arg: -r, --replace_string - String that will replace matches
+# | arg: -t, --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=$3
+	# Declare an array to define the options of this helper.
+	declare -Ar args_array=( [m]=match_string= [r]=replace_string= [f]=target_file= )
+	local match_string
+	local replace_string
+	local target_file
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
 
-  # Escape any backslash to preserve them as simple backslash.
-  match_string=${match_string//\\/"\\\\"}
-  replace_string=${replace_string//\\/"\\\\"}
+	# Escape any backslash to preserve them as simple backslash.
+	match_string=${match_string//\\/"\\\\"}
+	replace_string=${replace_string//\\/"\\\\"}
 
 	# Escape the & character, who has a special function in sed.
 	match_string=${match_string//&/"\&"}
 	replace_string=${replace_string//&/"\&"}
 
-	ynh_replace_string "$match_string" "$replace_string" "$workfile"
+	ynh_replace_string "$match_string" "$replace_string" "$target_file"
 }