How can I set the grep after context to be “until the next blank line”?

Question

With grep I know how to set the context to a fixed number of lines. Is it possible to show a context based on an arbitrary string condition, like set after-context to \"until th

Answer 1

A simple solution is:

awk '/pattern/' RS= input-file

Setting RS to the empty string makes awk treat blank lines as the record separator, and the simple rule /pattern/ causes awk to print any record that matches the pattern, which can be any extended regular expression.