import re
rx = r"([^\s\d]+\s+[^\s\d]+) (\d+)"
text = " 2012-15-08 07:05 *** Error importing row no. 5: The import of 785 line failed because of 345 item"
print( re.findall(rx, text))
aW1wb3J0IHJlCnJ4ID0gciIoW15cc1xkXStccytbXlxzXGRdKykgKFxkKykiCnRleHQgPSAiIDIwMTItMTUtMDggMDc6MDUgKioqIEVycm9yIGltcG9ydGluZyByb3cgbm8uIDU6IFRoZSBpbXBvcnQgb2YgNzg1IGxpbmUgZmFpbGVkIGJlY2F1c2Ugb2YgMzQ1IGl0ZW0iCnByaW50KCByZS5maW5kYWxsKHJ4LCB0ZXh0KSkK