regular expression question

[stuckonjava]

If the question was there are three items A, B, and C, and the user can pick any one of these items, however hte user must pick at least 3 and no more than 20 would the following work?


[A|B|C] [A|B|C] [A|B|C] [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]? [A|B|C]?


I know there is a way t make it shorter, but for now would this accept the correct entries?


Thanks

[JosAH]

Note that those spaces are significant ...

kind regards,

Jos

[DarrylBurke]

The pipe character | has no special significance inside a character class.

Recommended learning resources:
Pattern (Java Platform SE 7 )
Lesson: Regular Expressions (The Java™ Tutorials > Essential Classes)
Regular-Expressions.info - Regex Tutorial, Examples and Reference - Regexp Patterns

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