Java matches regular expression

Hi,
I have this regular expression which i would be using with matches..

String reg = "(?:\\s|\\A)[##]+([A-Za-z0-9-_]+)";

What does this mean? there is ? and etc...To me, it looks, like the string must start with s or A followed by the hash sign and then, it should words ...Is this right ?
zizi21Asked:
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Matthew KellyConnect With a Mentor Commented:
Here is a list of all the regular expression codes that you can use as future reference: http://www.cheatography.com/davechild/cheat-sheets/regular-expressions/

The expression would find a string that started with either "\A##" or "\s##" and then was followed by a string of letters, numbers or a dash or underscore.

So for example "\s##TestingRegEx" would match.

You can test it here, highlighted over each part even outlines what each one means:

http://gskinner.com/RegExr/
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zizi21Author Commented:
Thanks a lot.
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