RegEx based configurable extract logic

This version fixes issues with regex based extraction logic. Now a new result format can be configured which uses the captures form RegEx, and generates a new value.

E.g. below extract logic will change IP address of 192.168.1.1 to 192-168-1-1

<Extract Type="RegEx" StartIndex="0" Length="0" RegEx="^([0-9]+).([0-9]+).([0-9]+).([0-9]+)" ResultPattern ="{0}-{1}-{2}-{3}"   IsDefault="false" DefaultValue="" />