Variable SQL_SERVER_LEXICALConst

SQL Server lexical rules: […] and "…" identifiers, '…' and N'…' strings with doubled quotes, -- line comments and nested block comments, @name parameters.

• Identifiers: https://learn.microsoft.com/en-us/sql/relational-databases/databases/database-identifiers
• Nested block comments: https://learn.microsoft.com/en-us/sql/t-sql/language-elements/slash-star-comment-transact-sql
• -- comments: https://learn.microsoft.com/en-us/sql/t-sql/language-elements/comment-transact-sql