Find text and add text in new line

[GG]

How to find a text and add text in new line?

original

abc
def
abc
ghi
abc

to be updated (find abc add xyz in new line)

abc
xyz
def
abc
xyz
ghi
abc
xyz

[PeterJones]

@GG ,

• FIND = abc(\R|\z)
  (find abc followed by either a newline or the end of the file)
• REPLACE = abc\r\nxyz\r\n
  (the \r\n is a newline sequence in windows EOL mode)
• Search Mode = regular expression