File setup_identities.sh fails on macOS due to BSD sed regex incompatibility

[ZeroToH3ro]

Description

The script setup_identities.sh does not work on macOS because it uses a GNU sed-style regular expression that is not compatible with BSD sed (the default on macOS).
This causes the script to crash during the chain_code replacement step.

Error Log

sed: 1: "s|^([[:space:]]*chain_c ...": \1 not defined in the RE

Root Cause

macOS uses BSD sed, while most Linux systems use GNU sed.
The script relies on features that only work in GNU sed:
• Extended regex groups without -E
• \1 backreference not recognized due to regex mismatch

Example problematic pattern:

sed "s|^([[:space:]]*chain_code:).*|\1 \"$CHAIN_CODE\"|"

This works in GNU sed but fails in BSD sed.

Steps to Reproduce

1. Run the script on macOS: ./setup_identities.sh

2. Script crashes with: sed: 1: "...": \1 not defined in the RE

Environment

OS: macOS (Apple Silicon)
Shell: zsh
sed version: BSD sed