I'm just learning Python, and I can't seem to figure out regular expressions.

r1 = re.compile("$.pdf")
if r1.match("spam.pdf"):
    print 'yes'
else:
    print 'no'

I want this code to print 'yes', but it obstinately prints 'no'. I've also tried each of the following:

r1 = re.compile(r"$.pdf")

r1 = re.compile("$ .pdf")

r1 = re.compile('$.pdf')

if re.match("$.pdf", "spam.pdf")

r1 = re.compile(".pdf")

Plus countless other variations. I've been searching for quite a while, but can't find/understand anything that solves my problem. Can someone help out a newbie?

python regex
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