update instructions

README.md

@@ -43,3 +43,28 @@ It populates "Select Import File:" dropdown with my list of files that match my
 `for Discover: `
 `(DFS-|Discover).*\.(csv|CSV) matches DFS- or Discover, then anything, then .csv or .CSV`
 `like DFS-whatever.csv   or   Discover.1234.CSV`
+
+** regex field parsing changed in v21 to hopefully give more flexibility. you need to use "named capture groups", as in: 
+`"?(?<value>.*?)"?(?:[,]|\Z)(?<rest>.*)`
+
+value = what string you want to pull out for the field value.
+rest = is left over line to parse next.
+
+if you have this line:
+01/14/2018,check 3000,My Store,$123.40,whatever
+
+it will parse like this:
+get value = 01/14/2018
+rest = check 3000,My Store,$123.40,whatever
+
+get value = check 3000
+rest = My Store,$123.40,whatever
+
+get value = My Store
+rest = $123.40,whatever
+
+get value = $123.40
+rest = whatever
+
+get value = whatever
+rest =