RegEx for matching various dates - regex

Question

I am trying to put together a regex statement to match on each of the below date formats.
* Mar 7, 2017
Mar. 7, 2017
* March 7, 2017
3-7-2017
03-07-2017
3-7-17
03-07-17
* 03/7/2017
* 03/07/17
* 3/7/17
Mar-07-2017
Mar-7-2017
March-07-2017
The below regex matches on the date formats that are indicated by an asterisk above. I have tried in vain to add to what I already have but have been unsuccessful.
([0-9]+)/([0-9]+)/([0-9]+)|([12]\d{3}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01]))|\w+\s\d{2},\s\d{4}|(?i)\b(?:Jan(?:uary)?|Feb(?:ruary)?|Mar(?:ch)?|Apr(?:il)?|May|Jun(?:e)?|Jul(?:y)?|Aug(?:ust)?|Sep(?:tember)?|Oct(?:ober)?|Nov(?:ember)?|Dec](?:ember)?)\b
(?:0?[1-9]|[1-2][0-9]|3[01]),? \d{4}
Any help is always appreciated!
* Bonus question *
On some occasions, there may be multiple date matches and I need it to find a match following a certain word. In the past I've used the below syntax by enclosing the regex statement between the parenthesis after the period.
(?<=Word).(StatementHere)

Answer 1

Try this then ...
([0-9]+)/([0-9]+)/([0-9]+)|((0?[1-9]|1[0-2])-(0?[1-9]|[12]\d|3[01])-(\d{4}|\d{2}))|\w+\s\d{2},\s\d{4}|(?i)\b(Jan(?:uary|\.)?|Feb(?:ruary|\.)?|Mar(?:ch|\.)?|Apr(?:il|\.)?|May|Jun(?:e|\.)?|Jul(?:y|\.)?|Aug(?:ust|\.)?|Sep(?:tember|\.)?|Oct(?:ober|\.)?|Nov(?:ember|\.)?|Dec(?:ember|\.)?)([ ](?:0?[1-9]|[1-2][0-9]|3[01]),?[ ]|-(?:0?[1-9]|[1-2][0-9]|3[01])-)(\d{4})
https://regex101.com/r/k1vaVN/1
Readable version
( [0-9]+ ) # (1)
/
( [0-9]+ ) # (2)
/
( [0-9]+ ) # (3)
|
( # (4 start)
( 0? [1-9] | 1 [0-2] ) # (5)
-
( 0? [1-9] | [12] \d | 3 [01] ) # (6)
-
( \d{4} | \d{2} ) # (7)
) # (4 end)
|
\w+ \s \d{2} , \s \d{4}
|
(?i)
\b
( # (8 start)
Jan
(?: uary | \. )?
| Feb
(?: ruary | \. )?
| Mar
(?: ch | \. )?
| Apr
(?: il | \. )?
| May
| Jun
(?: e | \. )?
| Jul
(?: y | \. )?
| Aug
(?: ust | \. )?
| Sep
(?: tember | \. )?
| Oct
(?: ober | \. )?
| Nov
(?: ember | \. )?
| Dec
(?: ember | \. )?
) # (8 end)
( # (9 start)
[ ]
(?: 0? [1-9] | [1-2] [0-9] | 3 [01] )
,? [ ]
| -
(?: 0? [1-9] | [1-2] [0-9] | 3 [01] )
-
) # (9 end)
( \d{4} ) # (10)
update
Just wrap the dates in a (?: ) group, then add whatever qualifier before
it that you need.
word[ ]or[ ]phrase[ ]+\K(?:([0-9]+)/([0-9]+)/([0-9]+)|((0?[1-9]|1[0-2])-(0?[1-9]|[12]\d|3[01])-(\d{4}|\d{2}))|\w+\s\d{2},\s\d{4}|(?i)\b(Jan(?:uary|\.)?|Feb(?:ruary|\.)?|Mar(?:ch|\.)?|Apr(?:il|\.)?|May|Jun(?:e|\.)?|Jul(?:y|\.)?|Aug(?:ust|\.)?|Sep(?:tember|\.)?|Oct(?:ober|\.)?|Nov(?:ember|\.)?|Dec(?:ember|\.)?)([ ](?:0?[1-9]|[1-2][0-9]|3[01]),?[ ]|-(?:0?[1-9]|[1-2][0-9]|3[01])-)(\d{4}))