Implemented regex validation for variables

internal/parser/lexer.go

@@ -137,7 +137,7 @@ func (l *Lexer) NextToken() Token {
 			return l.emit(TokenLBracket)
 		case ']':
 			return l.emit(TokenRBracket)
-		case '&', '?', '!', '<', '>', '*', '(', ')':
+		case '&', '?', '!', '<', '>', '*', '(', ')', '~', '%', '^':
 			return l.emit(TokenSymbol)
 		case '"':
 			return l.lexString()

internal/parser/parser.go

@@ -296,6 +296,12 @@ func (p *Parser) parseVariableDefinition(startTok Token) (Definition, bool) {
 			break
 		}
 		if t.Type == TokenEqual {
+			if p.peekN(1).Type == TokenSymbol && p.peekN(1).Value == "~" {
+				p.next()
+				p.next()
+				typeTokens = append(typeTokens, Token{Type: TokenSymbol, Value: "=~", Position: t.Position})
+				continue
+			}
 			break
 		}
 		typeTokens = append(typeTokens, p.next())

test/regex_variable_test.go

@@ -0,0 +1,53 @@
+package integration
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/marte-community/marte-dev-tools/internal/index"
+	"github.com/marte-community/marte-dev-tools/internal/parser"
+	"github.com/marte-community/marte-dev-tools/internal/validator"
+)
+
+func TestRegexVariable(t *testing.T) {
+	content := `
+#var IP: string & =~"^[0-9.]+$" = "127.0.0.1"
+#var BadIP: string & =~"^[0-9.]+$" = "abc"
+
++Obj = {
+    IP = $IP
+}
+`
+	// Test Validator
+	pt := index.NewProjectTree()
+	p := parser.NewParser(content)
+	cfg, err := p.Parse()
+	if err != nil {
+		t.Fatalf("Parse failed: %v", err)
+	}
+	pt.AddFile("regex.marte", cfg)
+
+	v := validator.NewValidator(pt, ".")
+	v.CheckVariables()
+
+	foundError := false
+	for _, d := range v.Diagnostics {
+		if strings.Contains(d.Message, "Variable 'BadIP' value mismatch") {
+			foundError = true
+		}
+	}
+
+	if !foundError {
+		t.Error("Expected error for BadIP")
+		for _, d := range v.Diagnostics {
+			t.Logf("Diag: %s", d.Message)
+		}
+	}
+
+	// Test valid variable
+	for _, d := range v.Diagnostics {
+		if strings.Contains(d.Message, "Variable 'IP' value mismatch") {
+			t.Error("Unexpected error for IP")
+		}
+	}
+}