import re
strs = ['options={}, params={vector_name=get_x, default_like_count=2, seeting_id=1200, system=0 back', 'literal options={}, params={setting_id=1200, seed_val=22, system=0, vector_name=get_Z foobar}', 'mystring3 = "params={seed_rand=1200, seed_val=22, system=0, vector_name=corodinate2, tt=lly}' ]
rx = re.compile(r'vector_name=(\w+)')
for s in strs:
	m = rx.search(s)
	if m:
		print(m.group(1))