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Convention/[RScript]/Matcher/LabelMatcher.cs

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+using System.Text.RegularExpressions;
+
+namespace Convention.RScript.Matcher
+{
+    public class LabelMatcher : IRSentenceMatcher
+    {
+        public bool Match(string expression, ref RScriptSentence sentence)
+        {
+            Regex LabelRegex = new(@"^label\s*\(\s*([a-zA-Z_][a-zA-Z0-9_]*)\s*\)$");
+            var LabelMatch = LabelRegex.Match(expression);
+            if (LabelMatch.Success)
+            {
+                sentence.mode = RScriptSentence.Mode.Label;
+                sentence.content = LabelMatch.Groups[1].Value;
+                return true;
+            }
+            return false;
+        }
+    }
+}