正規

1. Origins, structure, and basic meaning

• Structure: 正規 (せいき) marks conformity with an authorized or official standard. 正規の会員 modifies membership status, while 正規品 forms a compound for authorized goods.
• Basic usage: The examples concern a full member registered through procedure and genuine products handled by a shop.

2. Common pitfalls and similar expressions

• Official membership and authorized merchandise
  • 正規の scopes over a person's membership status; 正規品 is a lexical product category. The separate sense “regular” is not supported by these contexts.