safe regex to find emails from html

Question

url ="https://www.siliconvalleypediatricdentistry.com/"
res=requests.get(url)
html=res.text
#re.findall(r'([\w0-9._-]+@[\w0-9._-]+\.[\w0-9_-]+)',html)
#re.findall(r"(^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$)",html)

I found plenty of questions regarding this but most of them are extracting "wrong" emails

I am getting this as output

['[email protected]',
 '[email protected]',
 '[email protected]',
 '[email protected]',
 '[email protected]',
 '[email protected]',
 '[email protected]']

some of them are just JS scripts, is there a safer regex to use or module that does this?

Email addresses are more complex than often thought. Imo the easiest way is to use a simpler regex like e.g. \S+@\S+ and actually send an email to that address. — Jan
– Jan, Commented Apr 7, 2020 at 19:21
@Jan how can I check if email exists without sending email ? — user11322373
– user11322373, Commented Apr 7, 2020 at 19:29
You can't. And even if you do send, many hosts won't respond with an error if the username doesn't exist. — John Gordon
– John Gordon, Commented Apr 7, 2020 at 19:32

Zorzi · Accepted Answer · 2020-04-07 19:38:09Z

1

That works for me:

re.findall(r'([\w-]+@[\w-]+\.[a-zA-Z]{1,5})',html)

Basically, we just force the end to be letters (e.g. .com), so the JS scripts don't match

edited Apr 7, 2020 at 19:38

answered Apr 7, 2020 at 19:23

Zorzi

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1 Comment

Jan Over a year ago

\w already include [0-9_], so your character class can be shortened to [-.\w].

nikoola · Accepted Answer · 2020-04-07 19:30:00Z

1

Just can try this:

r'^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,6})+$'

Or you can use your our own regex and just check if the email address are valid with:

from validate_email import validate_email
is_valid = validate_email('[email protected]')

answered Apr 7, 2020 at 19:30

nikoola

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2 Comments

user11322373 Over a year ago

nice module, does it actually send an email if not then how does it check

nikoola Over a year ago

It checks if the SMTP Server exists and can check if it that server has that email address without sending an email. More info at: pypi.org/project/validate_email

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