CSVediting.md

@@ -72,7 +72,7 @@ second one.    This should be written using a `columnNo` parameter to a more gen
 kernel, and performing the necessary number of `ScanTo` and `Advance` operations.
 The name of the kernel should actually be different for each columnNo.
 ```
-MaskOutField::MaskOutField2(BuilderRef b, StreamSet * Record_separators, 
+MaskOutField::MaskOutField(BuilderRef b, StreamSet * Record_separators, 
                                           StreamSet * Field_separators, 
                                           StreamSet * toKeep,
                                           unsigned columnNo)
@@ -85,3 +85,24 @@ MaskOutField::MaskOutField2(BuilderRef b, StreamSet * Record_separators,
 Finally, the first column must be handled differently.   In this case, there is
 no preceding comma, so the mask should zero out the following comma rather than the
 preceding comma.
+
+## Matching and Deleting a Row
+
+Suppose that we have a regular expression R to select CSV rows for deletion.  
+The Parabix regular expression engine can be used to perform the matching and
+`FilterByMask` can be used for the deletion.
+
+Using the ICGrepKernel to perform the matching may be implemented as follows.
+
+```
+    auto options = std::make_unique<GrepKernelOptions>(&cc::UTF8);
+    options->setSource(BasisBits);
+    StreamSet * MatchResults = P->CreateStreamSet(1, 1);
+    options->setResults(MatchResults);
+    options->setRE(R);
+    P->CreateKernelCall<ICGrepKernel>(std::move(options));
+```
+
+
+
+