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Hi!
You can first split the string by '-' character, so you will have "REG20140509" and store into a String variable (let's say date).
After that you can apply a regexp over this string. Use "\\w"...

Hi. You are getting errors because you have a return statement in the constructor.
If you remove the return it should be ok.
PS: In future, add a private identifier to your instance variables.