I want to also catch everything on the same line of XYZ.

You can say that explicitly: s/ABC(.*?)XYZ\N*\n/\[DATA\]\n/s will produce your desired output. (Note \N was added in 5.12, for older versions you can say e.g. [^\n].)

Minor edits shortly after posting.

In reply to Re: Replacing between patterns by haukex
in thread Replacing between patterns by ovedpo15

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