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#!/usr/bin/perl

...
  print "ends with x and optional y or z\n" if /x(y|z)?$/;
}
close (FILE);

flee
flex

--flee--
--flex--
Wide character (U+FFFD) in pattern match (m//) at ./fmin line 14, <FIL
+E> line 2.
ends with x and optional y or z