Question

Flash tells me that instance names must contain “alphanumeric characters, supported symbols, and no whitespace”. I’ve found the underscore is allowed, but not the minus sign.

Does anyone have a definitive list of all supported symbols?

Answer 1

Quoting Adobe Livedocs

Instance names must conform to the
following requirements:

• The name must not contain any spaces.
• The first character must be a letter, underscore (_), or dollar sign
  ($).
• Each subsequent character must be a letter, number, underscore, or dollar
  sign.
• The instance name must be unique.