How do I replace commas in a string [closed]

Answer 1

You don't need RE for that trivial operation. just use replace() on string:

a="123,asd,wer"
a.replace(",", "")

Answer 2

Why a regex?

mystring = mystring.replace(",", "")

is enough.

Of course, if you insist:

mystring = re.sub(",", "", mystring)

but that's probably an order of magnitude slower.