From ea68158b9718ccb87e516abcc5276cde8c2dccf0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Nussbaumer?= <clement@astutus.org>
Date: Thu, 12 Aug 2021 14:26:15 +0200
Subject: [PATCH] replace PCRE regexp with standard regexp

Permits to run the script on simpler/lighter Linux distributions,
e.g. OpenWRT, where the grep utility available does not permit to use
Perl extended regexp (the `grep -P` option)
---
 cloudflare-template.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/cloudflare-template.sh b/cloudflare-template.sh
index f0f1e59..e05f973 100644
--- a/cloudflare-template.sh
+++ b/cloudflare-template.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 auth_email=""                                      # The email used to login 'https://dash.cloudflare.com'
 auth_method="token"                                # Set to "global" for Global API Key or "token" for Scoped API Token 
@@ -46,7 +46,7 @@ fi
 ###########################################
 ## Get existing IP
 ###########################################
-old_ip=$(echo "$record" | grep -Po '(?<="content":")[^"]*' | head -1)
+old_ip=$(echo "$record" | sed -E 's/.*"content":"(([0-9]{1,3}\.){3}[0-9]{1,3})".*/\1/')
 # Compare if they're the same
 if [[ $ip == $old_ip ]]; then
   logger "DDNS Updater: IP ($ip) for ${record_name} has not changed."
@@ -56,7 +56,7 @@ fi
 ###########################################
 ## Set the record identifier from result
 ###########################################
-record_identifier=$(echo "$record" | grep -Po '(?<="id":")[^"]*' | head -1)
+record_identifier=$(echo "$record" | sed -E 's/.*"id":"(\w+)".*/\1/')
 
 ###########################################
 ## Change the IP@Cloudflare using the API