regular expression behaving weird in django urls - regex

Question

Here is regular expression in urls.py
url(r'^company_data/(?:[A-Za-z]+)/((?:0?[1-9]|[12][0-9]|3[01])(?:0?[1-9]|1[012])(?:20)?[0-9]{2})*/((?:0?[1-9]|[12][0-9]|3[01])(?:0?[1-9]|1[012])(?:20)?[0-9]{2})*$', 'stats.views.second', name='home'),
my views.py
def second(request,comp_name,offset_min,offset_max=None):
I am calling in this way from browser /company_data/hello/24092014/25092014
Expecting in the below way
comp_name= "hello", offset_min="24092014",offset_max="25092014"
In reality it is
comp_name="24092014",offset_max="25092014"
What wrong did I do here??
Thanks in advance!!
enter code here

Answer 1

You're missing a capture group 1.
Edit: Also note that groups 2 and 3 should be done like below, unless I'm reading you
wrong and you intend to retrieve the last part of particular number groups.
# '^/?company_data/([A-Za-z]+)/((?:(?:0?[1-9]|[12][0-9]|3[01])(?:0?[1-9]|1[012])(?:20)?[0-9]{2})*)/((?:(?:0?[1-9]|[12][0-9]|3[01])(?:0?[1-9]|1[012])(?:20)?[0-9]{2})*)$'
^
/? company_data /
( [A-Za-z]+ ) # (1)
/
( # (2 start)
(?:
(?: 0? [1-9] | [12] [0-9] | 3 [01] )
(?: 0? [1-9] | 1 [012] )
(?: 20 )?
[0-9]{2}
)*
) # (2 end)
/
( # (3 start)
(?:
(?: 0? [1-9] | [12] [0-9] | 3 [01] )
(?: 0? [1-9] | 1 [012] )
(?: 20 )?
[0-9]{2}
)*
) # (3 end)
$
Output:
** Grp 0 - ( pos 0 , len 37 )
/company_data/hello/24092014/25092014
** Grp 1 - ( pos 14 , len 5 )
hello
** Grp 2 - ( pos 20 , len 8 )
24092014
** Grp 3 - ( pos 29 , len 8 )
25092014