regular expression to analyze site link

Question

I tried to create a regex string to analyze link

site- www.example.com/page.php?u=userid&action=add&date=yyyy-MM-dd

I want to create named groups as:

site: includes the full requested link     
user: includes value of u parameter    
action: includes value of action parameter

by taking example above the result will be:

site: www.example.com/page.php?u=userid&action=add&date=yyyy-MM-dd    
user: userid    
action: add

Answer 1

This regex gives you named captures of site, user and action,

(?=(?<site>www.*$))(?=.*u=(?<user>(?:[^&]*)))(?=.*action=(?<action>(?:[^&]*)))

Play here,

https://regex101.com/r/1VAgSO/1

Answer 2

Python 3

In[2]: from urllib.parse import parse_qs, urlparse
In[3]: url = 'www.example.com/page.php?u=userid&action=add&date=yyyy-MM-dd'
In[4]: parsed_url = urlparse(url)
In[5]: parsed_url
Out[5]: ParseResult(scheme='', netloc='', path='www.example.com/page.php', params='', query='u=userid&action=add&date=yyyy-MM-dd', fragment='')
In[6]: parsed_query = parse_qs(parsed_url.query)
In[7]: parsed_query
Out[7]: {'u': ['userid'], 'action': ['add'], 'date': ['yyyy-MM-dd']}
In[8]: {'site': url, 'user': parsed_query['u'], 'action': parsed_query['action']}
Out[8]: 
{'site': 'www.example.com/page.php?u=userid&action=add&date=yyyy-MM-dd',
 'user': ['userid'],
 'action': ['add']}

• https://docs.python.org/3/library/urllib.parse.html#urllib.parse.urlparse
• https://docs.python.org/3/library/urllib.parse.html#urllib.parse.parse_qs