jakarta regexp (java strutsÕýÔò±í´ïʽ)
Character Classes
[abc] Simple character class
[a-zA-Z] Character class with ranges
[^abc] Negated character class
NOTE: Incomplete ranges will be interpreted as "starts from zero" or "ends with last character".
I.e. [-a] is the same as [\\u0000-a], and [a-] is the same as [a-\\uFFFF], [-] means "all characters".
Standard POSIX Character Classes
[:alnum:] Alphanumeric characters.
[:alpha:] Alphabetic characters.
[:blank:] Space and tab characters.
[:cntrl:] Control characters.
[:digit:] Numeric characters.
[:graph:] Characters that are printable and are also visible.
(A space is printable, but not visible, while an
 
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