Regex Extract Delete all but Customer Code:

Question

I have a long text file and I want to save all the lines that are similar to the following:

Customer Code: BER17O

How can I use REGEX to delete all the data except these lines?

Answer 1

Use multiline option with this regex

^(?!Customer Code: \w+$).*$

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OR[if you want to be specific]

^(?!Customer Code: BER17O$).*$

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(?!) is a negative lookahead which doesnt match the line if the line starts with Customer Code: followed by the word!