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Format!

[abc]A single character of: a, b, or c
[^abc]Any single character except: a, b, or c
[a-z]Any single character in the range a-z
[a-zA-Z]Any single character in the range a-z or A-Z
^Start of line
$End of line
\AStart of string
\zEnd of string
.Any single character

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