Regular Expressions 101

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"
/./
"
/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
. matches any character (except for line terminators)
/ matches the character / with index 4710 (2F16 or 578) literally (case sensitive)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"

Test String