RegEx find BlueSky Handle

import re
from typing import List, Dict

def parse_mentions(text: str) -> List[Dict]:
    spans = []
    # regex based on: https://atproto.com/specs/handle#handle-identifier-syntax
    mention_regex = rb"[$|\W](@([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)"
    text_bytes = text.encode("UTF-8")
    for m in re.finditer(mention_regex, text_bytes):
        spans.append({
            "start": m.start(1),
            "end": m.end(1),
            "handle": m.group(1)[1:].decode("UTF-8")
        })
    return spans


# Parse facets from text and resolve the handles to DIDs
def parse_facets(text: str) -> List[Dict]:
    facets = []
    for m in parse_mentions(text):
        print (m)

parse_facets("@cheerlights.bsky.social test test test @cymplecy.bsky.social")