import re
x='def{{{12.197835/// -0.001172, 12.19788 7.3E-5, //+{{12.196705 -1.7E-5, 12.196647 -0.001189///}}}Def'
print(re.findall(r'[+-]?\d*\.?\d+(?:[eE][+-]?\d+)?', x)) # Extracting all numbers into a list
print(",".join(re.findall(r'[+-]?\d*\.?\d+(?:[eE][+-]?\d+)?', x))) # Creating a comma-separated string
aW1wb3J0IHJlCng9J2RlZnt7ezEyLjE5NzgzNS8vLyAtMC4wMDExNzIsIDEyLjE5Nzg4IDcuM0UtNSwgLy8re3sxMi4xOTY3MDUgLTEuN0UtNSwgMTIuMTk2NjQ3IC0wLjAwMTE4OS8vL319fURlZicKcHJpbnQocmUuZmluZGFsbChyJ1srLV0/XGQqXC4/XGQrKD86W2VFXVsrLV0/XGQrKT8nLCB4KSkgICMgRXh0cmFjdGluZyBhbGwgbnVtYmVycyBpbnRvIGEgbGlzdApwcmludCgiLCIuam9pbihyZS5maW5kYWxsKHInWystXT9cZCpcLj9cZCsoPzpbZUVdWystXT9cZCspPycsIHgpKSkgIyBDcmVhdGluZyBhIGNvbW1hLXNlcGFyYXRlZCBzdHJpbmc=
['12.197835', '-0.001172', '12.19788', '7.3E-5', '12.196705', '-1.7E-5', '12.196647', '-0.001189']
12.197835,-0.001172,12.19788,7.3E-5,12.196705,-1.7E-5,12.196647,-0.001189