Use regular expressions to represent strings that do not contain 2950--regular expressions

Use the VBA test in Excel as follows (the match is: ^ (?!) 2950).) *$):
Sub regs ()
Dim RegEx as Object
Set RegEx = CreateObject ("VBScript.RegExp")
Dim S, Mat
s = "399295078"
Regex.pattern = "^ ((?!) 2950).) *$"
Regex.global = True
MsgBox Regex.test (s)
Set RegEx = Nothing
End Sub
If 2950 is matched, the return is false, otherwise true.
of which, (?!) 2950) indicates a mismatch of 2950,
and ^ represents the starting position of the matching string,
. Represents a match for any single character except "\ n".
$ indicates the end position of the matching string.
* indicates that the preceding subexpression was matched 0 or more times.
The whole match is to match a null value or a string that does not contain 2950.
of which (?!) 2950 must be followed by a ".", then (?!) 2950). Indicates that there is no 2950 and at least one character. In fact, the whole is (?!) 2950) and (.) * The combination, (.) * indicates an empty string or any string (does not contain \ n).