Shorthand classes
| Pattern | Meaning |
|---|---|
\w | "Word" character (letter, digit, or underscore) |
\d | Digit |
\s | Whitespace (space, tab, vtab, newline) |
\W, \D, or \S | Not word, digit, or whitespace |
[\D\S] | Means not digit or whitespace, both match |
[^\d\s] | Disallow digit and whitespace |
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