Python regular expression match whole word

Question

I\'m having trouble finding the correct regular expression for the scenario below:

Lets say:

a = \"this is a sample\"

I want to mat

Answer 1

Try using the "word boundary" character class in the regex module, re:

x="this is a sample"
y="this isis a sample."
regex=re.compile(r"\bis\b")  # For ignore case: re.compile(r"\bis\b", re.IGNORECASE)

regex.findall(y)
[]

regex.findall(x)
['is']

From the documentation of re.search().

\b matches the empty string, but only at the beginning or end of a word

...

For example r'\bfoo\b' matches 'foo', 'foo.', '(foo)', 'bar foo baz' but not 'foobar' or 'foo3'