Python/Regex - How to extract date from filename using regular expression?

Question

I need to use python to extract the date from filenames. The date is in the following format:

month-day-year.somefileextension

Examples:

Answer 1

**This is simple method to find date from text file in python**
import os
import re
file='rain.txt' #name of the file
if(os.path.isfile(file)): #cheak if file exists or not
    with open(file,'r') as i:
        for j in i: #we will travarse line by line in file 
            try:
                match=re.search(r'\d{2}-\d{2}-\d{4}',j) #regular expression for date
                print(match.group()) #print date if match is found
            except AttributeError: 
                pass
else:
    print("file does not exist")