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))
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