d{2}/d{1,2}/d{4}$

([1-3]?d/.+?/d{4})

# coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility

import re

regex = r"([1-3]?d/.+?/d{4})"

test_str = ("$83,00010/7/2016 ----> 10/7/2016 is the date here,n"
    "$721,0002/7/2015 ----> 2/7/2015 is the date here,n"
    "$3,00012/12/2015  -----> 12/12/2015 is the date here")

matches = re.finditer(regex, test_str, re.MULTILINE)

for matchNum, match in enumerate(matches, start=1):

    print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group()))

    for groupNum in range(0, len(match.groups())):
        groupNum = groupNum + 1

        print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum)))

# Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.

(?:1[0-2]|[0-9])/[0-9]{2}/[0-9]{4}$