Regular Expressions 101

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"
\bpossible\b
"
g
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
possible
matches the characters possible literally (case sensitive)
\b assert position at a word boundary: (^\w|\w$|\W\w|\w\W)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"
g

Test String