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Say I have a text containing the words red and blue.
How do I replace occurences of the word blue with the word green only in all lines containing the word red?
Likewise how can I replace blue with green in all lines NOT containing the word red?
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To use RegEx, the first argument of replace will be replaced with regex syntax, for example /regex/ . This syntax serves as a pattern where any parts of the string that match it will be replaced with the new substring. The string 3foobar4 matches the regex /\d. *\d/ , so it is replaced.
To replace "blue" with "green" in lines that contain "red":
:g/red/s/blue/green To do the replacement in lines that do not contain "red":
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