This sets a number of individual matches that this rule should find first. These first few matches are
not counted in the results. Onlny matches starting after this number of initial matches are counted.
If less than this number of matches are found in the text, no match will count. For instance if a rule
searches for matches of "a" in "a a r d v a r k", starting after 2, then only the 3*rd "a" (the one between
"v" and "r") will count. If StartAfter is set to 3, there will be no matches. If StartAfter is 1, then
then the 2*nd and 3*rd occurences of "a" will count as matches.
The default StartAfter value is 0. This means all matches that are found will count.