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You could also use the -o option to egrep

$ echo PO_CREATE12457888888888889SK1234567878744551111111111SK89456321145789955455555SK8888888815788852222 | egrep -o "SK.{8}"
SK12345678
SK89456321...

The regex
"*\([^|"]*\)"* applied to
abc|123"|gh-ch"|23.067"will yield the first parenthesized subexpression to be used by the back reference
abc
123
gh-ch
23.067
Any existing double quotes...

If what you want to do is separate records at points where the last character on a line is a <period>, <question-mark>, or <exclamation-point>, you probably want to use:
RS="[.?!]$"
as rdrtx1...