diff --git a/Composer/packages/lib/indexers/__tests__/validations/expressionValidation.test.ts b/Composer/packages/lib/indexers/__tests__/validations/expressionValidation.test.ts
index a59edce2bc..205770561f 100644
--- a/Composer/packages/lib/indexers/__tests__/validations/expressionValidation.test.ts
+++ b/Composer/packages/lib/indexers/__tests__/validations/expressionValidation.test.ts
@@ -69,4 +69,14 @@ describe('validate expression', () => {
     const result = checkExpression("=concat('test', '1')", true, [ReturnType.String]);
     expect(result).toBe(24);
   });
+
+  it('use LG expressions will not throw error', () => {
+    try {
+      checkExpression('${LGChoiceOptions()}', true, [ReturnType.Number]);
+    } catch (error) {
+      expect(error.message).toBe(
+        "LGChoiceOptions does not have an evaluator, it's not a built-in function or a custom function."
+      );
+    }
+  });
 });
diff --git a/Composer/packages/lib/indexers/src/validations/expressionValidation/validation.ts b/Composer/packages/lib/indexers/src/validations/expressionValidation/validation.ts
index c9449a975f..2e2f1976e3 100644
--- a/Composer/packages/lib/indexers/src/validations/expressionValidation/validation.ts
+++ b/Composer/packages/lib/indexers/src/validations/expressionValidation/validation.ts
@@ -20,6 +20,23 @@ export const addReturnType = (currentType: number, newType: number) => {
   return currentType | newType;
 };
 
+export const trimExpression = (expression: string): string => {
+  let result = expression.trim();
+  if (result.startsWith('=')) {
+    result = result.substring(1).trim();
+  }
+
+  if (result.startsWith('$')) {
+    result = result.substring(1).trim();
+  }
+
+  if (result.startsWith('{') && result.endsWith('}')) {
+    result = result.substring(1, result.length - 1).trim();
+  }
+
+  return result;
+};
+
 export const checkStringExpression = (exp: string, isStringType: boolean): number => {
   const origin = exp.trim();
   const containsEqual = origin.startsWith('=');
@@ -28,7 +45,9 @@ export const checkStringExpression = (exp: string, isStringType: boolean): numbe
     return ReturnType.String;
   }
 
-  return Expression.parse(containsEqual ? origin.substring(1) : origin).returnType;
+  const trimmedOrigin = trimExpression(origin);
+
+  return Expression.parse(trimmedOrigin).returnType;
 };
 
 export const checkExpression = (exp: any, required: boolean, types: number[]): number => {
diff --git a/extensions/azurePublish/yarn-berry.lock b/extensions/azurePublish/yarn-berry.lock
index 341fa33905..66e2f1a714 100644
--- a/extensions/azurePublish/yarn-berry.lock
+++ b/extensions/azurePublish/yarn-berry.lock
@@ -1994,7 +1994,7 @@ __metadata:
 
 "@bfc/indexers@file:../../Composer/packages/lib/indexers::locator=azurePublish%40workspace%3A.":
   version: 0.0.0
-  resolution: "@bfc/indexers@file:../../Composer/packages/lib/indexers#../../Composer/packages/lib/indexers::hash=f8e51f&locator=azurePublish%40workspace%3A."
+  resolution: "@bfc/indexers@file:../../Composer/packages/lib/indexers#../../Composer/packages/lib/indexers::hash=5e1a82&locator=azurePublish%40workspace%3A."
   dependencies:
     "@microsoft/bf-lu": 4.15.0-dev.20210702.cbf708d
     adaptive-expressions: ^4.18.0
@@ -2003,7 +2003,7 @@ __metadata:
     tslib: 2.6.2
   peerDependencies:
     "@bfc/shared": "*"
-  checksum: 984e67c6cc13359b2415904ce8ab616960ebff71ca7066a491d5f9ac6b8fa299a6e005cbb0ef09a9d2248f9ea2404fde5d76eb7864bea9acc2190801198be3e1
+  checksum: f7684cb3a745ad13885dc745763b4b461d151536e0de52464a9f44a646c60d2ba6d07b96d5859c4e2a33bb0ef4654ed0f55d9901d3be02602219e3c706f4cac7
   languageName: node
   linkType: hard
 
diff --git a/extensions/azurePublishNew/yarn-berry.lock b/extensions/azurePublishNew/yarn-berry.lock
index 862eedbacd..538e2f4380 100644
--- a/extensions/azurePublishNew/yarn-berry.lock
+++ b/extensions/azurePublishNew/yarn-berry.lock
@@ -2031,7 +2031,7 @@ __metadata:
 
 "@bfc/indexers@file:../../Composer/packages/lib/indexers::locator=azure-publish-new%40workspace%3A.":
   version: 0.0.0
-  resolution: "@bfc/indexers@file:../../Composer/packages/lib/indexers#../../Composer/packages/lib/indexers::hash=f8e51f&locator=azure-publish-new%40workspace%3A."
+  resolution: "@bfc/indexers@file:../../Composer/packages/lib/indexers#../../Composer/packages/lib/indexers::hash=5e1a82&locator=azure-publish-new%40workspace%3A."
   dependencies:
     "@microsoft/bf-lu": 4.15.0-dev.20210702.cbf708d
     adaptive-expressions: ^4.18.0
@@ -2040,7 +2040,7 @@ __metadata:
     tslib: 2.6.2
   peerDependencies:
     "@bfc/shared": "*"
-  checksum: 984e67c6cc13359b2415904ce8ab616960ebff71ca7066a491d5f9ac6b8fa299a6e005cbb0ef09a9d2248f9ea2404fde5d76eb7864bea9acc2190801198be3e1
+  checksum: f7684cb3a745ad13885dc745763b4b461d151536e0de52464a9f44a646c60d2ba6d07b96d5859c4e2a33bb0ef4654ed0f55d9901d3be02602219e3c706f4cac7
   languageName: node
   linkType: hard