internal class CustomRegexStyle : RegexStyle
    {
        protected override void DrawCore(System.Collections.Generic.IEnumerable<Feature> features, GeoCanvas canvas, System.Collections.ObjectModel.Collection<SimpleCandidate> labelsInThisLayer, System.Collections.ObjectModel.Collection<SimpleCandidate> labelsInAllLayers)
        {
            foreach (Feature feature in features)
            {
                //string fieldValue = feature.ColumnValues[this.ColumnName].Trim();
                //Collection<RegexItem> regexItemCollection = GetRegexItems(fieldValue,this.RegexMatchingRule);

                // The above is the original logic for only one column, you can add your codes to support the multi columns.

                Feature[] tmpFeatures = new Feature[1] { feature };
                foreach (RegexItem regexItem in regexItemCollection)
                {
                    if (regexItem.CustomStyles.Count == 0)
                    {
                        regexItem.DefaultAreaStyle.Draw(tmpFeatures, canvas, labelsInThisLayer, labelsInAllLayers);
                        regexItem.DefaultLineStyle.Draw(tmpFeatures, canvas, labelsInThisLayer, labelsInAllLayers);
                        regexItem.DefaultPointStyle.Draw(tmpFeatures, canvas, labelsInThisLayer, labelsInAllLayers);
                        regexItem.DefaultTextStyle.Draw(tmpFeatures, canvas, labelsInThisLayer, labelsInAllLayers);
                    }
                    else
                    {
                        foreach (ThinkGeo.MapSuite.Core.Style style in regexItem.CustomStyles)
                        {
                            style.Draw(tmpFeatures, canvas, labelsInThisLayer, labelsInAllLayers);
                        }
                    }
                }
            }
        }

        private Collection<RegexItem> GetRegexItems(string columnValue, RegexMatching regexMatching)
        {
            Collection<RegexItem> results = new Collection<RegexItem>();

            if (regexMatching == RegexMatching.MatchFirstOnly)
            {
                var matchingItem = this.RegexItems.FirstOrDefault(tmpItem =>
                {
                    Regex regex = new Regex(tmpItem.RegularExpression);
                    return regex.IsMatch(columnValue);
                });

                if (matchingItem != null) results.Add(matchingItem);
            }
            else
            {
                bool isMatchAll = this.RegexItems.All(tmpItem =>
                {
                    Regex regex = new Regex(tmpItem.RegularExpression);
                    return regex.IsMatch(columnValue);
                });

                if (isMatchAll)
                {
                    foreach (var item in this.RegexItems)
                    {
                        results.Add(item);
                    }
                }
            }

            return results;
        }
    }