mainly theoratical work on semi, add regex sample

src/StgSharp.RegularAnalysis/Text/RegexIR.cs

@@ -73,12 +73,14 @@ namespace StgSharp.RegularAnalysis.Text
 
     }
 
+    internal interface IRegexMatch { }
+
     /// <summary>
     ///   Searches for a certain string pattern or charset from current position.
     /// </summary>
     internal sealed class RegexMatchSeqIR(
                           string pattern
-    ) : RegexIR(RegexIRCommand.Match_Seq), IRegexSequence
+    ) : RegexIR(RegexIRCommand.Match_Seq), IRegexSequence, IRegexMatch
     {
 
         public string Pattern { get; } = pattern;
@@ -92,7 +94,7 @@ namespace StgSharp.RegularAnalysis.Text
 
     internal sealed class RegexMatchSetIR(
                           string charset
-    ) : RegexIR(RegexIRCommand.Match_Set)
+    ) : RegexIR(RegexIRCommand.Match_Set), IRegexMatch
     {
 
         public string Charset { get; } = charset;
@@ -225,7 +227,7 @@ namespace StgSharp.RegularAnalysis.Text
 
     internal sealed class RegexTryIR(
                           int count
-    ) : RegexIR(RegexIRCommand.Try), IRegexComplex
+    ) : RegexIR(RegexIRCommand.Try), IRegexComplex, IRegexMatch
     {
 
         public bool IsFullyOptimized { get; set; }

src/StgSharp.RegularAnalysis/Text/TextRegexSourceGen.GenClass.MultiIR.cs

@@ -19,6 +19,24 @@ namespace StgSharp.RegularAnalysis.Text
     internal partial class TextRegexSourceGen
     {
 
+        private static int GenerateNamedCountAny(
+                           ReadOnlySpan<RegexIR> region_ir,
+                           SourceGenContext sc,
+                           in SequenceEmitter<string> main_emitter,
+                           in List<SequenceEmitter<string>> sub_emitter_list
+        )
+        {
+            if (region_ir[0] is not RegexCountSetIR { IsDotStar:true} ||
+                region_ir[1] is not RegexPackIR pack) {
+                return -1;
+            }
+            if (region_ir[2] is RegexMatchSeqIR) { }
+            _ = main_emitter.AppendLine($@"do").AppendLine($@"{{");
+            _ = main_emitter.AppendLine($@"}}").AppendLine($@"while(true);");
+            string group_idx = sc.MakeNewNamedGroup(pack.GroupName);
+            return 0;
+        }
+
         private static void GenerateRegion(
                             ReadOnlySpan<RegexIR> region_ir,
                             SourceGenContext sc,
@@ -35,7 +53,8 @@ namespace StgSharp.RegularAnalysis.Text
                 int result;
                 int count = 0;
                 scan_win = ir_sp[index..];
-                if ((result = TryGenerateFindSeq(scan_win, sc, in main_emitter,
+                if ((result =
+                     TryGenerateFindSeq(scan_win, sc, in main_emitter,
                                                  in sub_emitter_list)) > 0)
                 {
                     count += result;
@@ -77,7 +96,7 @@ namespace StgSharp.RegularAnalysis.Text
 
             if (scan_win[1] is RegexMatchSeqIR seq)
             {
-                string seq_pat = FormatStringLiteral(find.Pattern + seq.Pattern);
+                string seq_pat = FormatStringLiteral($"{find.Pattern}{seq.Pattern}");
                 _ = main_emitter.AppendLine(@$"//Match sequence:{seq_pat} at current pos")
                                 .AppendLine($@"if(  )");
             }

src/StgSharp.RegularAnalysis/Text/TextRegexSourceGen.GenContext.cs

@@ -50,6 +50,26 @@ namespace StgSharp.RegularAnalysis.Text
                 }
             }
 
+            #region namig group
+
+            private int _min_named_group;
+            private Dictionary<string, int> _name_idx_map = [];
+
+            public string MakeNewNamedGroup(
+                          string name
+            )
+            {
+                if (_name_idx_map.TryGetValue(name, out int idx)) {
+                    return $"__named_group_{idx}";
+                }
+                idx = _min_named_group;
+                _name_idx_map[name] = idx;
+                _min_named_group++;
+                return $"__named_group_{idx}";
+            }
+
+            #endregion
+
             public string FindResult
             {
                 get