re.findall failing for regex with grouping in Python
pat = "[w]+[ ]*@[ ]*[w]+.[w]+"
re.findall(pat, 'abc@cs.stansoft.edu.com .rtrt.. myacc@gmail.com ')

['abc@cs.stansoft', 'myacc@gmail.com']

pat = "[w]+[ ]*@[ ]*[w]+(.[w]+)*"
re.findall(pat, 'abc@cs.stansoft.edu.com .rtrt.. myacc@gmail.com ')

['.com', '.com']

pat = "[w.]+ *@ *w+(?:.w+)*"
re.findall(pat, 'abc@cs.stansoft.edu.com .rtrt.. myacc@gmail.com ')

pat = '([w.-]+)@([w.-]+)'
re.findall(pat, 'abc@cs.stansoft.edu.com .rtrt.. myacc@gmail.com ')

[('abc', 'cs.stansoft.edu.com'), ('myacc', 'gmail.com')]

emails = 'abc@cs.stansoft.edu.com .rtrt.. myacc@gmail.com '
pat = '([w.-]+)@([w.-]+)'
re.sub(pat, r'1@live.com', emails)

'abc@live.com .rtrt.. myacc@live.com '

pat = '[w.-]+@[w.-]+'
re.findall(pat, 'abc@cs.stansoft.edu.com .rtrt.. myacc@gmail.com ')

['abc@cs.stansoft.edu.com', 'myacc@gmail.com']