print "$1\n" while $line=~s/(\w+\s+\w+|\w+)[}|\s+|\s+{]//;

Metacharacters like  | are not meta-special in a character class, so  [}|\s+|\s+{] from the quoted regex is equivalent, with the pipe metacharacter explicitly escaped (for clarity), to  [\s{}\|] or, less verbosely, to the  [\s{}|] class. (In other words, there's no alternation in a character class.)

In reply to Re^2: Splitting string using two overlapping patterns by AnomalousMonk
in thread Splitting string using two overlapping patterns by kpr

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