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I have a file with over 1000 lines

Like this
CM.ID=1448 OR
CM.ID=1740 OR
CM.ID=1741 OR
CM.ID=1742 OR
CM.ID=1744 OR
CM.ID=2621 OR
CM.ID=2622 OR
CM.ID=2623 OR

etc

I would like the file to look like this
CM.ID=1448 OR CM.ID=1740 OR CM.ID=1741 OR CM.ID=1742 OR
CM.ID=1744 OR CM.ID=2621 OR CM.ID=2622 OR CM.ID=2623 OR

I think you mean you want to replace every line break except every fourth one with a space.

Find what: (.*)\n(.*)\n(.*)\n(.*)\n
Replace with: $1 $2 $3 $4\n

[X] Regular expression

Replace All

ben_josephs wrote:I think you mean you want to replace every line break except every fourth one with a space.

Find what: (.*)\n(.*)\n(.*)\n(.*)\n
Replace with: $1 $2 $3 $4\n

[X] Regular expression

Replace All

Ben I get an error
States Cannot match Regular Expression

Any idea what I might be doing wrong?

Has a spurious space been introduced at the end of the regex?