fix(zmodel): validate @regex regular expression patterns

packages/schema/src/language-server/validator/attribute-application-validator.ts

@@ -212,6 +212,21 @@ export default class AttributeApplicationValidator implements AstValidator<Attri
         }
     }
 
+    @check('@regex')
+    private _checkRegex(attr: AttributeApplication, accept: ValidationAcceptor) {
+        const regex = getStringLiteral(attr.args[0]?.value);
+        if (regex === undefined) {
+            accept('error', `Expecting a string literal`, { node: attr.args[0] ?? attr });
+            return;
+        }
+
+        try {
+            new RegExp(regex);
+        } catch (e) {
+            accept('error', `${e}`, { node: attr.args[0] });
+        }
+    }
+
     private rejectEncryptedFields(attr: AttributeApplication, accept: ValidationAcceptor) {
         streamAllContents(attr).forEach((node) => {
             if (isDataModelFieldReference(node) && hasAttribute(node.target.ref as DataModelField, '@encrypted')) {

packages/schema/tests/schema/validation/attribute-validation.test.ts

@@ -1369,4 +1369,26 @@ describe('Attribute tests', () => {
         `)
         ).resolves.toContain(`attribute "@omit" cannot be used on type declaration fields`);
     });
+
+    it('validates regex', async () => {
+        await expect(
+            loadModelWithError(`
+            ${prelude}
+            model User {
+                id String @id
+                phone String @regex(id)
+            }
+        `)
+        ).resolves.toContain('Expecting a string literal');
+
+        await expect(
+            loadModelWithError(`
+            ${prelude}
+            model User {
+                id String @id
+                phone String @regex("^(\\+46|0)[0-9]{7,12}$")
+            }
+        `)
+        ).resolves.toContain('Invalid regular expression');
+    });
 });