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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