Regexp escape table name for MS SQL

activerecord/CHANGELOG.md

@@ -1,3 +1,9 @@
+*   Regexp-escape table name for MS SQL
+
+    Add `Regexp.escape` to one method in ActiveRecord, so that table names with regular expression characters in them work as expected. Since MS SQL Server uses "[" and "]" to quote table and column names, and those characters are regular expression characters, methods like `pluck` and `select` fail in certain cases when used with the MS SQL Server adapter.
+
+    *Larry Reid*
+
 *   Store advisory locks on their own named connection.
 
     Previously advisory locks were taken out against a connection when a migration started. This works fine in single database applications but doesn't work well when migrations need to open new connections which results in the lock getting dropped.

activerecord/lib/active_record/relation/query_methods.rb

@@ -1253,7 +1253,9 @@ def arel_column(field)
       end
 
       def table_name_matches?(from)
-        /(?:\A|(?<!FROM)\s)(?:\b#{table.name}\b|#{connection.quote_table_name(table.name)})(?!\.)/i.match?(from.to_s)
+        table_name = Regexp.escape(table.name)
+        quoted_table_name = Regexp.escape(connection.quote_table_name(table.name))
+        /(?:\A|(?<!FROM)\s)(?:\b#{table_name}\b|#{quoted_table_name})(?!\.)/i.match?(from.to_s)
       end
 
       def reverse_sql_order(order_query)