Name Requirements for Key Variables name-requirements-for-key-variables

This article describes the naming conventions used by the key variable in a key-value pair.

Naming Requirements for Keys

In Expression Builder, the name of a key variable in a key-value pair can consist of any number of digits followed by 1 (or more) letters, a dash, an underscore, and additional digits.

  • Valid key names: price123, 123price, price-123, c_price123.

  • Invalid key names: 123, price!123.

Prefixing Key Variables with c_

The c_ prefix is always required if the parameters that send in data on an event call URL use that syntax.