# your code goes here
import re
s = 'с "[x1200]" и заканчивающиеся ";" '
match = re.search(r"\[x1200\](.*);", s, re.IGNORECASE)
if match:
print(match.group(0)) # [x1200]" и заканчивающиеся ";
print(match.group(1)) # " и заканчивающиеся "
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCmltcG9ydCByZQpzID0gJ9GBICJbeDEyMDBdIiDQuCDQt9Cw0LrQsNC90YfQuNCy0LDRjtGJ0LjQtdGB0Y8gIjsiICcKbWF0Y2ggPSByZS5zZWFyY2gociJcW3gxMjAwXF0oLiopOyIsIHMsIHJlLklHTk9SRUNBU0UpCmlmIG1hdGNoOgoJcHJpbnQobWF0Y2guZ3JvdXAoMCkpICAjIFt4MTIwMF0iINC4INC30LDQutCw0L3Rh9C40LLQsNGO0YnQuNC10YHRjyAiOwoJcHJpbnQobWF0Y2guZ3JvdXAoMSkpICAjICIg0Lgg0LfQsNC60LDQvdGH0LjQstCw0Y7RidC40LXRgdGPICIK