I am trying to figure out a regular expression which matches any string that doesn't start with mpeg. A generalization of this is matching any string which doesn't start with a given regular expression.

I tried something like as follows:

[^m][^p][^e][^g].*

The problem with this is that it requires at least 4 characters to be present in the string. I was not able to figure out a good way to handle this and a generalized way to handle this in a general purpose manner.

I will be using this in Python.

python regex
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