fix: syntax of variables we support

Author: Kneesal

libs/journeys/ui/src/components/TextResponse/utils/getTextResponseValues/getTextResponseValues.spec.ts

@@ -66,13 +66,15 @@ describe('getTextResponseValues', () => {
   it('resolves values for embed variant', () => {
     const input: TextResponseStrings = {
       label: '  {{ name }}  ',
+      // incorrect syntax should return unresolved:
       placeholder: '{{ title: CTO }}',
+      // incorrect syntax should return unresolved:
       hint: '{{ some: value }}'
     }
     const result = getTextResponseValues(input, fields, 'embed')
     expect(result.label).toBe('  Alice  ')
-    expect(result.placeholder).toBe('Child of God')
-    expect(result.hint).toBe('Some Value')
+    expect(result.placeholder).toBe('{{ title: CTO }}')
+    expect(result.hint).toBe('{{ some: value }}')
   })
 
   it('replaces custom fields within mixed strings and leaves non-custom-field text intact', () => {

libs/journeys/ui/src/libs/resolveJourneyCustomizationString/resolveJourneyCustomizationString.spec.ts

@@ -42,31 +42,31 @@ describe('resolveJourneyCustomizationString', () => {
     )
   })
 
-  it('ignores inline value content and still resolves from fields (quoted)', () => {
+  it('does not support inline values; leaves tokens with colon unchanged (quoted)', () => {
     expect(
       resolveJourneyCustomizationString("{{ name: 'Knee Sail' }}", fields)
-    ).toBe('Alice')
+    ).toBe("{{ name: 'Knee Sail' }}")
     expect(
       resolveJourneyCustomizationString(
         '{{ title: "Some Random Title" }}',
         fields
       )
-    ).toBe('Child of God')
+    ).toBe('{{ title: "Some Random Title" }}')
   })
 
-  it('ignores inline value content and still resolves from fields (unquoted)', () => {
+  it('does not support inline values; leaves tokens with colon unchanged (unquoted)', () => {
     expect(resolveJourneyCustomizationString('{{ some: value }}', fields)).toBe(
-      'Some Value'
+      '{{ some: value }}'
     )
   })
 
-  it('replaces custom fields regardless of surrounding whitespace', () => {
+  it('replaces key-only custom fields regardless of surrounding whitespace', () => {
     expect(resolveJourneyCustomizationString('  {{ name }}  ', fields)).toBe(
       '  Alice  '
     )
     expect(
       resolveJourneyCustomizationString('  {{ title:  Some Title  }}', fields)
-    ).toBe('  Child of God')
+    ).toBe('  {{ title:  Some Title  }}')
   })
 
   it('trims spaces around the key before lookup', () => {

libs/journeys/ui/src/libs/resolveJourneyCustomizationString/resolveJourneyCustomizationString.ts

@@ -1,20 +1,18 @@
 import { JourneyFields_journeyCustomizationFields as JourneyCustomizationField } from '../../libs/JourneyProvider/__generated__/JourneyFields'
 
 /**
- * Resolves a string that may strictly equal a customization template of the form
- * "{{ key }}" or "{{ key: value }}" against provided journey customization fields.
- * - Requires the entire string (after trim) to match the pattern.
- * - If key is found, returns field.value ?? field.defaultValue.
- * - If no match, key not found, or no resolved value, returns the original input.
+ * Resolves all occurrences of customization templates within a string.
+ * Supports only the "{{ key }}" syntax (no inline value support).
+ * - For each custom field: returns field.value ?? field.defaultValue if key exists; otherwise keeps the custom field.
+ * - Multiple custom fields and repeated keys are supported in one pass.
  */
 export function resolveJourneyCustomizationString(
   input: string | null,
   journeyCustomizationFields: JourneyCustomizationField[]
 ): string | null {
   if (input == null) return null
 
-  const customFieldsPattern =
-    /\{\{\s*([^:}]+)(?:\s*:\s*(?:(['"])([^'"]*)\2|([^}]*?)))?\s*\}\}/g
+  const customFieldsPattern = /\{\{\s*([^:}]+)\s*\}\}/g
 
   const replaced = input.replace(customFieldsPattern, (fullMatch, key) => {
     const trimmedKey = String(key).trim()