Matching Predefined Character Classes
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Following are various examples of matching predefined character classes using regular expression in java.
| Sr.No | Construct & Matches |
|---|---|
| 1 | .
Any character (may or may not match line terminators). |
| 2 | d
A digit: [0-9]. |
| 3 | D
A non-digit: [^0-9]. |
| 4 | s
A whitespace character: [ tnx0Bfr] |
| 5 | S
A non-whitespace character: [^s]. |
| 6 | w
A word character: [a-zA-Z_0-9]. |
| 7 | W
A non-word character: [^w] |
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