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I have a text file with 15000 rows (See sample below)

How can I insert 2 lines after every 5th instance of the word "ENTER"

I need to insert the a new line with the word "ENTER" and a second line with the string "DELAY 35000"

Thanks

• DELAY 5000
  CODE: 1234
  ENTER
  DELAY 500
  CODE: 0000
  ENTER
  DELAY 500
  CODE: 1111
  ENTER
  DELAY 500
  CODE: 2580
  ENTER
  DELAY 500
  CODE: 1212
  ENTER
  DELAY 500
  CODE: 5555
  ENTER
  DELAY 500
  CODE: 2222
  ENTER
  DELAY 5000
  CODE: 1234
  ENTER
  DELAY 500
  CODE: 0000
  ENTER
  DELAY 500
  CODE: 1111
  ENTER
  DELAY 500
  CODE: 2580
  ENTER
  DELAY 500
  CODE: 1212
  ENTER
  DELAY 500
  CODE: 5555
  ENTER
  DELAY 500
  CODE: 2222
  ENTER

Search | Replace... (<F8>):

Find what: ([\s\S]*?ENTER){5}
Replace with: $0\nENTER\nDELAY 35000

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Note: [\s\S] matches any character that is white space or is not white space, that is, any character at all, including a newline (which . does not match).