Adding REGEXP support for block searching

[stgram]

This is to evade the problem in which searching for Diamond Ore brought up Quartz Stairs. In SQL syntax, %SEARCH_STRING%, % matches everything, even digits. Diamond ore is 56, Quartz Stairs 156 The provided example negates digits and some special symbols for quantity and after-id values to trim the results to the proper ones. Note: This so far reduces a lot results when searching for both a keyword and a block, rarely used combination I hope.