FF-1578: Fixed duplicate key issue in Pattern Match flow element

BasicNodes/Functions/PatternMatch.cs

@@ -1,20 +1,34 @@
-namespace FileFlows.BasicNodes.Functions;
-
 using System.ComponentModel;
 using System.ComponentModel.DataAnnotations;
 using System.Text.RegularExpressions;
 using FileFlows.Plugin;
 using FileFlows.Plugin.Attributes;
+
+namespace FileFlows.BasicNodes.Functions;
+
+/// <summary>
+/// Flow element that matches the working file or the original file against a regular expression pattern 
+/// </summary>
 public class PatternMatch : Node
 {
+    /// <inheritdoc />
     public override int Inputs => 1;
+    /// <inheritdoc />
     public override int Outputs => 2;
+    /// <inheritdoc />
     public override FlowElementType Type => FlowElementType.Logic;
+    /// <inheritdoc />
     public override string Icon => "fas fa-equals";
+    /// <inheritdoc />
     public override string HelpUrl => "https://fileflows.com/docs/plugins/basic-nodes/pattern-match";
 
     private Dictionary<string, object> _Variables;
+    /// <inheritdoc />
     public override Dictionary<string, object> Variables => _Variables;
+    
+    /// <summary>
+    /// Constructs a new instance of the Pattern Match object
+    /// </summary>
     public PatternMatch()
     {
         _Variables = new Dictionary<string, object>()
@@ -23,11 +37,15 @@ public class PatternMatch : Node
         };
     }
 
+    /// <summary>
+    /// Gets or sets the pattern to match against
+    /// </summary>
     [DefaultValue("")]
     [Text(1)]
     [Required]
     public string Pattern { get; set; }
 
+    /// <inheritdoc />
     public override int Execute(NodeParameters args)
     {
         if (string.IsNullOrEmpty(Pattern))
@@ -38,12 +56,12 @@ public class PatternMatch : Node
             var rgx = new Regex(Pattern, RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
             if (rgx.IsMatch(args.WorkingFile))
             {
-                args.Variables.Add("PatternMatch", rgx.Match(args.WorkingFile).Value);
+                args.Variables["PatternMatch"] = rgx.Match(args.WorkingFile).Value;
                 return 1;
             }
             if (rgx.IsMatch(args.FileName))
             {
-                args.Variables.Add("PatternMatch", rgx.Match(args.FileName).Value);
+                args.Variables["PatternMatch"] = rgx.Match(args.FileName).Value;
                 return 1;
             }
             return 2;