import re
rx = r"(\S+)\s+(?:gun store|establishments|supermarket)\b"
text = "As reported on 30 December 2019, in Maipu, Metropolitan region, a group of at least 10 rioters attempted to loot a local gun store."
m = re.search(rx, text)
if m:
print(m.group(1))
aW1wb3J0IHJlCnJ4ID0gciIoXFMrKVxzKyg/Omd1biBzdG9yZXxlc3RhYmxpc2htZW50c3xzdXBlcm1hcmtldClcYiIKdGV4dCA9ICJBcyByZXBvcnRlZCBvbiAzMCBEZWNlbWJlciAyMDE5LCBpbiBNYWlwdSwgTWV0cm9wb2xpdGFuIHJlZ2lvbiwgYSBncm91cCBvZiBhdCBsZWFzdCAxMCByaW90ZXJzIGF0dGVtcHRlZCB0byBsb290IGEgbG9jYWwgZ3VuIHN0b3JlLiIKbSA9IHJlLnNlYXJjaChyeCwgdGV4dCkKaWYgbToKICAgIHByaW50KG0uZ3JvdXAoMSkp