Function parsePatterns

packages/hardhat-utils/src/internal/debug.ts:23–45

(env: string)

 * `createDebug` is called many times at startup.
 */
export function parsePatterns(env: string): ParsedPatterns {
  if (cached !== undefined && cached.env === env) {
    return cached.parsed;
  }

  const include: RegExp[] = [];
  const exclude: RegExp[] = [];

  for (const raw of env.split(/[\s,]+/)) {
    if (raw === "") {
      continue;
    }
    if (raw.startsWith("-")) {
      exclude.push(namespaceToRegExp(raw.slice(1)));
    } else {
      include.push(namespaceToRegExp(raw));
    }
  }

  const parsed: ParsedPatterns = { include, exclude };
  cached = { env, parsed };
  return parsed;
}

/**
 * Converts a `DEBUG`-style namespace pattern into an anchored regex.