Q: extracting email address from exception message In python-social-auth, when a user registers with an existing email address, an exception is raised.
I managed to catch this exception:
msg =   "%s" % exception

If I print msg, I get the following output:
(1062, "Duplicate entry 'email@id.com' for key 'email_UNIQUE'")

I would like to detect this exception and display a custom error message to the user, something like: 

This email id already exists please login with email@id.com or choose to sign in.

So my question is, how do I get only the email address from the exception message? Or is there any shortcut like {{ exception.email }} to get the email address in the template?

A: use regular expression    
import re

strs="""(1062, "Duplicate entry 'email@id.com' for key 'email_UNIQUE'")"""

email_id =re.findall(r"'(.*?)'", strs, re.DOTALL)[0]
print 'This email id already exists please login with {} or choose to sign in.'.format(email_id)
#output This email id already exists please login with email@id.com or choose to sign in.

