Using Regular Expressions, create a Python program that finds all the words in a given sentence that end with 'ing'.
This is a sentence containing a lot of words ending in 'ing'.
import re
 
sentence = "This is a sentence containing a lot of words ending in 'ing'."
pattern = r"\w+ing\b"
 
words = re.findall(pattern, sentence)
 
print(words)
 
# Output: ['containing', 'ending']