add support for the regex-split crate to add split_inclusive functionality

[kpdowney]

In the python split if a capture group is used the split returns the split character in addition to the delimited tokens. The default rust regex crate does not do this. I believe this is used pretty extensively in python and would be a great add IMO.

[itsmeadarsh2008]

@kpdowney
Can you give me an example of how you would do that native re-module in Python (no flpc)? (inclusive of a test regex and valid strings to test against, So I check my code according to the output)
How exactly do you want your code to be structured? consistent naming system. The underscore in split_inclusive functionality kills the point of being an analogical library.

[KevinPD66]

Good morning and sorry for the delay. Super simple example with the standard re module. Here I have split on a space, a period and an exclamation mark. With a capture group if brings back both the words as well as what I split on. This is the functionality I was suggesting as a consideration. The naming I mentioned is not important - whatever you feel is best I would be very happy with. Thanks for your help.

text = "The fox jumps over the dog. Poor dog!"
re.split(r'(\s|.|!)', text)

Output:
['The',
' ',
'fox',
' ',
'jumps',
' ',
'over',
' ',
'the',
' ',
'dog',
'.',
'',
' ',
'Poor',
' ',
'dog',
'!',
'']

[itsmeadarsh2008]

I'm unsure about the issue, but adding a separate dependency would make it unnecessarily bloated.