regex how to detect special characters that are not encoded

Question

If I have a string like "this%25is a%string %" how can I come up with a regex expression that can detect and replace the "%" signs that arent followed by a "25"? So I would wanna leave the %25 alone since its already encoded.

score 2 · Accepted Answer · answered Aug 22 '22 at 17:09

2

You can use negative lookahead

/%(?!(25))/

This would match any % not followed by 25

regex how to detect special characters that are not encoded

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