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The information about using the asterisk applies only to pattern matching rules; it does not apply to regular expression (RegEx) rules.
For AE Services dial plan settings, valid dial string characters are: all digits (0-9), the number sign (#), and the asterisk (*).
If your dial plan uses the asterisk or the number sign, and you need to configure a dial plan rule that detects the asterisk and the number sign, you must precede them with a backslash. For example to interpret the asterisk as a literal you would use \* and to interpret the number sign as a literal you would use \#.
For example, if you need to have the asterisk interpreted as a literal asterisk in either the Matching Pattern field or the Replacement String field of a From TelURI or a To TelURI table, you must precede the asterisk with a backslash. If you do not precede the asterisk with a backslash, it will be interpreted as a wildcard value for any valid character.
When you want to use the asterisk as a wildcard for any character, you must use it as a single character (by itself). That is, when used as a wildcard, the asterisk can not be preceded or followed by any other character.