Allow users to specify data types of information extracted using regex.

[bestchai]

Currently, the user is able to extract information from log text using regular expressions. However, everything is stored as a string, which makes it impossible to (for example), extract dates from logs and remove all events that happened during a particular time of day.

We want the user to be able to specify the data type along with the capture group name (the syntax might look something like: "(?groupName:dataType.*)" ).

[Issue created by pqperry: 2014-05-16] [Last updated on bitbucket: 2014-08-26]

[Comment created by pqperry: 2014-05-16] Yeah, that's what I was thinking. Currently, the ones I have in mind are number, date, ipAddress, vectorClock, and string.

[Comment created by bestchai: 2014-05-16] I guess we'll have some pre-defined data types that we'll support, without supporting user-defined data types, right?