Extract domain name from URL in Python
Question:
I am tring to extract the domain names out of a list of URLs. Just like in
https://stackoverflow.com/questions/18331948/extract-domain-name-from-the-url
My problem is that the URLs can be about everything, few examples:
m.google.com
=> google
m.docs.google.com
=> google
www.someisotericdomain.innersite.mall.co.uk
=> mall
www.ouruniversity.department.mit.ac.us
=> mit
www.somestrangeurl.shops.relevantdomain.net
=> relevantdomain
www.example.info
=> example
And so on..
The diversity of the domains doesn’t allow me to use a regex as shown in how to get domain name from URL (because my script will be running on enormous amount of urls from real network traffic, the regex will have to be enormous in order to catch all kinds of domains as mentioned).
Unfortunately my web research the didn’t provide any efficient solution.
Does anyone have an idea of how to do this ?
Any help will be appreciated !
Thank you
Answers:
It seems you can use urlparse https://docs.python.org/3/library/urllib.parse.html for that url, and then extract the netloc.
And from the netloc you could easily extract the domain name by using split
With regex, you could use something like this:
(?<=.)([^.]+)(?:.(?:co.uk|ac.us|[^.]+(?:$|n)))
https://regex101.com/r/WQXFy6/5
Notice, you’ll have to watch out for special cases such as co.uk
.
Use tldextract
which is more efficient version of urlparse
, tldextract
accurately separates the gTLD
or ccTLD
(generic or country code top-level domain) from the registered domain
and subdomains
of a URL.
>>> import tldextract
>>> ext = tldextract.extract('http://forums.news.cnn.com/')
ExtractResult(subdomain='forums.news', domain='cnn', suffix='com')
>>> ext.domain
'cnn'
Simple solution via regex
import re
def domain_name(url):
return url.split("www.")[-1].split("//")[-1].split(".")[0]
import re
def getDomain(url:str) -> str:
'''
Return the domain from any url
'''
# copy the original url text
clean_url = url
# take out protocol
reg = re.findall(':[0-9]+',url)
if len(reg) > 0:
url = url.replace(reg[0],'')
# take out paths routes
if '/' in url:
url = url.split('/')
# select only the domain
if 'http' in clean_url:
url = url[2]
# preparing for next operation
url = ''.join(url)
# select only domain
url = '.'.join(url.split('.')[-2:])
return url
from urllib.parse import urlparse
import validators
hostnames = []
counter = 0
errors = 0
for row_orig in rows:
try:
row = row_orig.rstrip().lstrip().split(' ')[1].rstrip()
if len(row) < 5:
print(f"Empty row {row_orig}")
errors += 1
continue
if row.startswith('http'):
domain = urlparse(row).netloc # works for https and http
else:
domain = row
if ':' in domain:
domain = domain.split(':')[0] # split at port after clearing http/https protocol
# Finally validate it
if validators.domain(domain):
pass
elif validators.ipv4(domain):
pass
else:
print(f"Invalid domain/IP {domain}. RAW: {row}")
errors +=1
continue
hostnames.append(domain)
if counter % 10000 == 1:
print(f"Added {counter}. Errors {errors}")
counter+=1
except:
print("Error in extraction")
errors += 1
I am tring to extract the domain names out of a list of URLs. Just like in
https://stackoverflow.com/questions/18331948/extract-domain-name-from-the-url
My problem is that the URLs can be about everything, few examples:
m.google.com
=> google
m.docs.google.com
=> google
www.someisotericdomain.innersite.mall.co.uk
=> mall
www.ouruniversity.department.mit.ac.us
=> mit
www.somestrangeurl.shops.relevantdomain.net
=> relevantdomain
www.example.info
=> example
And so on..
The diversity of the domains doesn’t allow me to use a regex as shown in how to get domain name from URL (because my script will be running on enormous amount of urls from real network traffic, the regex will have to be enormous in order to catch all kinds of domains as mentioned).
Unfortunately my web research the didn’t provide any efficient solution.
Does anyone have an idea of how to do this ?
Any help will be appreciated !
Thank you
It seems you can use urlparse https://docs.python.org/3/library/urllib.parse.html for that url, and then extract the netloc.
And from the netloc you could easily extract the domain name by using split
With regex, you could use something like this:
(?<=.)([^.]+)(?:.(?:co.uk|ac.us|[^.]+(?:$|n)))
https://regex101.com/r/WQXFy6/5
Notice, you’ll have to watch out for special cases such as co.uk
.
Use tldextract
which is more efficient version of urlparse
, tldextract
accurately separates the gTLD
or ccTLD
(generic or country code top-level domain) from the registered domain
and subdomains
of a URL.
>>> import tldextract
>>> ext = tldextract.extract('http://forums.news.cnn.com/')
ExtractResult(subdomain='forums.news', domain='cnn', suffix='com')
>>> ext.domain
'cnn'
Simple solution via regex
import re
def domain_name(url):
return url.split("www.")[-1].split("//")[-1].split(".")[0]
import re
def getDomain(url:str) -> str:
'''
Return the domain from any url
'''
# copy the original url text
clean_url = url
# take out protocol
reg = re.findall(':[0-9]+',url)
if len(reg) > 0:
url = url.replace(reg[0],'')
# take out paths routes
if '/' in url:
url = url.split('/')
# select only the domain
if 'http' in clean_url:
url = url[2]
# preparing for next operation
url = ''.join(url)
# select only domain
url = '.'.join(url.split('.')[-2:])
return url
from urllib.parse import urlparse
import validators
hostnames = []
counter = 0
errors = 0
for row_orig in rows:
try:
row = row_orig.rstrip().lstrip().split(' ')[1].rstrip()
if len(row) < 5:
print(f"Empty row {row_orig}")
errors += 1
continue
if row.startswith('http'):
domain = urlparse(row).netloc # works for https and http
else:
domain = row
if ':' in domain:
domain = domain.split(':')[0] # split at port after clearing http/https protocol
# Finally validate it
if validators.domain(domain):
pass
elif validators.ipv4(domain):
pass
else:
print(f"Invalid domain/IP {domain}. RAW: {row}")
errors +=1
continue
hostnames.append(domain)
if counter % 10000 == 1:
print(f"Added {counter}. Errors {errors}")
counter+=1
except:
print("Error in extraction")
errors += 1