Just look here for documentation

BR

guy038

Well, it depends on the location where you want to insert this new line :

• If you want to insert this new line at the very end of current file :

  • SEARCH \z

  • REPLACE \r\n

• If you vant to insert this new line after the Nth first lines of current file

  • SEARCH (?-s)\A((?:.*\R){N})

  • REPLACE \1\r\n

• If you want to insert this new line after the line ( or each line ) containing the named string String

  • SEARCH (?-s)(?<=String)(.*\R)

  • REPLACE \1\r\n

For instance, given this INPUT text :

This is a
small example
of text
to test the
regexes
Hope this test will
be OK

The first regex S/R would produce :

This is a
small example
of text
to test the
regexes
Hope this test will
be OK

The regex S/R :

• SEARCH (?-s)\A((?:.*\R){5})

• REPLACE \1\r\n

gives the following OUTPUT text :

This is a
small example
of text
to test the
regexes

Hope this test will
be OK

and, finally, the regex S/R :

• SEARCH (?-s)(?<=test)(.*\R)

• REPLACE \1\r\n

would return :

This is a
small example
of text
to test the

regexes
Hope this test will

be OK

Best Regards,

guy038

P.S. :

Of course, select the Regular expression search mode and tick the Wrap around option !

Well you’d have to start by specifying how to identify these “certain lines already present”, i.e., what makes them special? There has to be a pattern to it otherwise it can’t be done.