dob_start

# Search the date of birth
def search_dob(text):

    # Define the pattern to get dates (20-07-2018, 20 07 2018, 20-07 2018, 20 07-2018)
    reg_dob = '(\d{2}[\/ -]\d{2}[\/ -]\d{2,4})'
    
    # Find all strings that match
    dates = re.findall(reg_dob, text)

    # We iterate through the results and convert it into datetime format
    for i in range(len(dates)):
        date = re.sub('[- ]', '', dates[i])
        try:
            dates[i] = datetime.strptime(date, '%d%m%Y')
        except:
            dates[i] = datetime.strptime('01013000', '%d%m%Y')
    
    # We take the smallest dates in a KTP, beacuse it must be his/her birth date
    date = min(dates)

    return datetime.strftime(date, '%d/%m/%Y')