Remove json_extract function

Signed-off-by: Christian König <ckoenig@posteo.de>

advanced/Scripts/updatecheck.sh

@@ -8,23 +8,6 @@
 # This file is copyright under the latest version of the EUPL.
 # Please see LICENSE file for your rights under this license.
 
-# Credit: https://stackoverflow.com/a/46324904
-function json_extract() {
-    local key=$1
-    local json=$2
-
-    local string_regex='"([^"\]|\\.)*"'
-    local number_regex='-?(0|[1-9][0-9]*)(\.[0-9]+)?([eE][+-]?[0-9]+)?'
-    local value_regex="${string_regex}|${number_regex}|true|false|null"
-    local pair_regex="\"${key}\"[[:space:]]*:[[:space:]]*(${value_regex})"
-
-    if [[ ${json} =~ ${pair_regex} ]]; then
-        echo $(sed 's/^"\|"$//g' <<< "${BASH_REMATCH[1]}")
-    else
-        return 1
-    fi
-}
-
 function get_local_branch() {
     # Return active branch
     cd "${1}" 2> /dev/null || return 1
@@ -61,19 +44,19 @@ if [[ "$2" == "remote" ]]; then
         sleep 30
     fi
 
-    GITHUB_CORE_VERSION="$(json_extract tag_name "$(curl -s 'https://api.github.com/repos/pi-hole/pi-hole/releases/latest' 2> /dev/null)")"
+    GITHUB_CORE_VERSION="$(curl -s 'https://api.github.com/repos/pi-hole/pi-hole/releases/latest' 2> /dev/null | jq --raw-output .tag_name)"
     addOrEditKeyValPair "${VERSION_FILE}" "GITHUB_CORE_VERSION" "${GITHUB_CORE_VERSION}"
 
     if [[ "${INSTALL_WEB_INTERFACE}" == true ]]; then
-        GITHUB_WEB_VERSION="$(json_extract tag_name "$(curl -s 'https://api.github.com/repos/pi-hole/AdminLTE/releases/latest' 2> /dev/null)")"
+        GITHUB_WEB_VERSION="$(curl -s 'https://api.github.com/repos/pi-hole/AdminLTE/releases/latest' 2> /dev/null | jq --raw-output .tag_name)"
         addOrEditKeyValPair "${VERSION_FILE}" "GITHUB_WEB_VERSION" "${GITHUB_WEB_VERSION}"
     fi
 
-    GITHUB_FTL_VERSION="$(json_extract tag_name "$(curl -s 'https://api.github.com/repos/pi-hole/FTL/releases/latest' 2> /dev/null)")"
+    GITHUB_FTL_VERSION="$(curl -s 'https://api.github.com/repos/pi-hole/FTL/releases/latest' 2> /dev/null | jq --raw-output .tag_name)"
     addOrEditKeyValPair "${VERSION_FILE}" "GITHUB_FTL_VERSION" "${GITHUB_FTL_VERSION}"
 
     if [[ "${PIHOLE_DOCKER_TAG}" ]]; then
-        GITHUB_DOCKER_VERSION="$(json_extract tag_name "$(curl -s 'https://api.github.com/repos/pi-hole/docker-pi-hole/releases/latest' 2> /dev/null)")"
+        GITHUB_DOCKER_VERSION="$(curl -s 'https://api.github.com/repos/pi-hole/docker-pi-hole/releases/latest' 2> /dev/null | jq --raw-output .tag_name)"
         addOrEditKeyValPair "${VERSION_FILE}" "GITHUB_DOCKER_VERSION" "${GITHUB_DOCKER_VERSION}"
     fi