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I post this about a month ago.  I've found a simple lpeg re pattern for above

It can handle "repeated" separactor too, say, "(.*)andand(.*) too.

pat = re.compile( "{ (.(g <- &%z / .g))* } %z {.*}", { z = 'and' } )

note: the loop never match the first position, but it is ok
the second %z take care of of text with %z up front.