Matching POSIX Character Classes
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Following are various examples of matching POSIX character classes using regular expression in java.
| Sr.No | Construct & Matches |
|---|---|
| 1 | p{Lower}
A lower-case alphabetic character: [a-z]. |
| 2 | p{Upper}
An upper-case alphabetic character:[A-Z]. |
| 3 | p{ASCII}
All ASCII:[x00-x7F]. |
| 4 | p{Alpha}
An alphabetic character:[p{Lower}p{Upper}]. |
| 5 | p{Digit}
A decimal digit: [0-9]. |
| 6 | p{Alnum}
An alphanumeric character:[p{Alpha}p{Digit}]. |
| 7 | p{Punct}
Punctuation: One of !”#$%&”()*+,-./:;?@[]^_>{|}<./> |
| 8 | p{Graph}
A visible character: [p{Alnum}p{Punct}]. |
| 9 | p{Print}
A printable character: [p{Graph}x20]. |
| 10 | p{Blank}
A space or a tab: [ t]. |
| 11 | p{XDigit}
A hexadecimal digit: [0-9a-fA-F]. |
| 12 | p{Space}
A whitespace character: [ tnx0Bfr]. |
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