import re
from datetime import datetime

_PLACEHOLDER_RE = re.compile(r"\{\{\s*(\w+)\s*\}\}")


def render_template(text: str, variables: dict[str, str]) -> str:
    return _PLACEHOLDER_RE.sub(lambda m: str(variables.get(m.group(1), m.group(0))), text)


def format_datetime_da(dt: datetime) -> str:
    return dt.strftime("%d-%m-%Y kl. %H:%M")