Introduced String Regex Condition Operator

Require complete string to be a full match

Changed to DarthAffe suggestion

Changed to fit new Condition API and match code style

src/Artemis.Core/DefaultTypes/Conditions/Operators/StringMatchesRegexConditionOperator.cs

@@ -0,0 +1,20 @@
+using System.Text.RegularExpressions;
+
+namespace Artemis.Core.DefaultTypes {
+    internal class StringMatchesRegexConditionOperator : ConditionOperator<string, string>
+    {
+        public override string Description => "Matches Regex";
+        public override string Icon => "Regex";
+
+        public override bool Evaluate(string text, string regex)
+        {
+            // Ensures full match
+            if (!regex.StartsWith("^"))
+                regex = "^" + regex;
+            if (!regex.EndsWith("$"))
+                regex += "$";
+
+            return Regex.IsMatch(text, regex);
+        }
+    }
+}

src/Artemis.Core/Services/Registration/ConditionOperatorService.cs

@@ -61,6 +61,7 @@ namespace Artemis.Core.Services
             RegisterConditionOperator(Constants.CorePluginInfo, new StringNotContainsConditionOperator());
             RegisterConditionOperator(Constants.CorePluginInfo, new StringStartsWithConditionOperator());
             RegisterConditionOperator(Constants.CorePluginInfo, new StringEndsWithConditionOperator());
+            RegisterConditionOperator(Constants.CorePluginInfo, new StringMatchesRegexConditionOperator());
 
             // Null checks, at the bottom
             // TODO: Implement a priority mechanism