Interpretation of regex?

can someone plz kindly tell me if my intepretation of the following regular expression is correct.

Code:

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String pattern="[A-Z](a-z([A-Z]+)0-9@-)*([^;\\s])*";

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Match string that has
1.Capital letter in the starting of the string
2.Followed by zero or more occurence of
1.letter ranging a-z
2.digit ranging from 0-9
3.symbol @
4. symbol -
5.and with atleast one or more occurence of capital letter
ranging from A-Z
3.Followed by anything but except a ; and whitespace

Thanks

The pattern can turn up in the middle of a String somewhere, as the beginning-of-line and end-of-line symbols are not used.

Then

Code:

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A-Z
0 or more occurrences of
    a-z
    0 or more occurrences of A-Z
    0-9
    @
    -
0 or more occurences of anything but ; or whitespace

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i.e. All of these match from after the third . until before the <space>

Code:

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...A+<space>...
...Aa0@-b<space>...
...Aa0@-a0@-b<space>...
...AaA0@-b<space>...
...AaA0@-a0@-b<space>...

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Thanks for the reply