Regular Expressions 101

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"
[^a-zA-Z]
"
Match a single character not present in the list below
[^a-zA-Z]
a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)
A-Z matches a single character in the range between A (index 65) and Z (index 90) (case sensitive)
Your regular expression does not match the subject string.

Regular Expression
No Match

r"
"

Test String