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PO
primarykey
Id
5494315
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2011-03-31T01:14:33.123
FavoriteCount
0
LastActivityDate
2017-10-25T10:51:30.003
LastEditDate
2017-10-25T10:51:30.003
LastEditorUserId
95967
OwnerUserId
433790
ParentId
5492825
PostTypeId
2
Score
3
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0
LastEditorDisplayName
text
Body
If you would like to go the regex route... RFC-3986 is the authority regarding URIs. <a href="http://tools.ietf.org/html/rfc3986#appendix-B" rel="nofollow noreferrer">Appendix B</a> provides this regex to break one down into its components: <pre class="lang-py prettyprint-override"><code>re_3986 = r"^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?" # Where: # scheme = $2 # authority = $4 # path = $5 # query = $7 # fragment = $9 </code></pre> Here is an enhanced, Python friendly version which utilizes named capture groups. It is presented in a function within a working script: <pre class="lang-py prettyprint-override"><code>import re def get_domain(url): """Return top two domain levels from URI""" re_3986_enhanced = re.compile(r""" # Parse and capture RFC-3986 Generic URI components. ^ # anchor to beginning of string (?: (?P<scheme> [^:/?#\s]+):// )? # capture optional scheme (?:(?P<authority> [^/?#\s]*) )? # capture optional authority (?P<path> [^?#\s]*) # capture required path (?:\?(?P<query> [^#\s]*) )? # capture optional query (?:\#(?P<fragment> [^\s]*) )? # capture optional fragment $ # anchor to end of string """, re.MULTILINE | re.VERBOSE) re_domain = re.compile(r""" # Pick out top two levels of DNS domain from authority. (?P<domain>[^.]+\.[A-Za-z]{2,6}) # $domain: top two domain levels. (?::[0-9]*)? # Optional port number. $ # Anchor to end of string. """, re.MULTILINE | re.VERBOSE) result = "" m_uri = re_3986_enhanced.match(url) if m_uri and m_uri.group("authority"): auth = m_uri.group("authority") m_domain = re_domain.search(auth) if m_domain and m_domain.group("domain"): result = m_domain.group("domain"); return result data_list = [ r"http://abdd.eesfea.domainname.com/b/33tA$/0021/file", r"http://mail.domainname.org/abc/abc/aaa", r"http://domainname.edu", r"http://domainname.com:80", r"http://domainname.com?query=one", r"http://domainname.com#fragment", r"www.domainname.com#fragment", r"https://domainname.com#fragment", ] cnt = 0 for data in data_list: cnt += 1 print("Data[%d] domain = \"%s\"" % (cnt, get_domain(data))) </code></pre> For more information regarding the picking apart and validation of a URI according to RFC-3986, you may want to take a look at an article I've been working on: <a href="http://jmrware.com/articles/2009/uri_regexp/URI_regex.html" rel="nofollow noreferrer">Regular Expression URI Validation</a>
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singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POExtract domain using regular expression
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 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USvarun
UserOwnerUserId
1. USridgerunner
plurals
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PostLinksRelatedPostIdPostId
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PostsParentIdCreationDate
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