Regular Expressions 101

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"
'\''S', '''s'
"
' matches the character ' with index 3910 (2716 or 478) literally (case sensitive)
\' matches the character ' with index 3910 (2716 or 478) literally (case sensitive)
'S', '''s'
matches the characters 'S', '''s' literally (case sensitive)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"

Test String