The names of identifiers in the named expression, HTTP callout,
pattern set, and rate limiting features must begin with an ASCII
alphabet or an underscore (_). The remaining characters can be
ASCII alphanumeric characters or underscores (_).
The names of these identifiers must not begin with
the following reserved words:
Additionally, the names of these identifiers cannot be the same as the names of enumeration constants used in the policy infrastructure. For example, the name of an identifier cannot be IGNORECASE, YEAR, or LATIN2_CZECH_CS (a MySQL character set).
Note: The NetScaler appliance performs a
case-insensitive comparison of identifiers with these words and
enumeration constants. For example, names of the identifiers cannot
begin with TRUE, True, or true.