Portability issues may restrict which characters should be used in an identifier.
This rule checks identifier names against a regular expression of disallowed characters. Due to a technical limitation, the COBOL analyzer is not
able for the time-being to differentiate lowercase from uppercase characters.
Noncompliant Code Example
With the default regular expression
MOVE DATA-1 TO DATA_2 *> Noncompliant; '_' not allowed
MOVE DATA-1 TO DATA-2