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Home/ Questions/Q 8945137
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Editorial Team
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Editorial Team
Asked: June 15, 20262026-06-15T12:10:56+00:00 2026-06-15T12:10:56+00:00

I have a long text file and I want to save all the lines

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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?

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  1. Editorial Team
    Editorial Team
    2026-06-15T12:10:57+00:00Added an answer on June 15, 2026 at 12:10 pm

    Use multiline option with this regex

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


    OR[if you want to be specific]

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


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

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