Updated based on review

hapi-fhir-base/src/main/java/ca/uhn/fhir/util/StringUtil.java

@@ -82,6 +82,10 @@ public class StringUtil {
 	/**
 	 * Check the input string has prefix token 
 	 * 
+	 * e.g. For a display text of “Body height”:
+	 *	searching on "Bo" or "he" should find it
+	 *	searching on "ei" or "dy" should not find it
+	 * 
 	 * @param theInput       the input string
 	 * @param thePrefix      the prefix string of a token
 	 * @return Return true if a input string token separated by space start with the prefix 

hapi-fhir-docs/src/main/resources/ca/uhn/hapi/fhir/changelog/5_3_0/2175_valueset_expension_filer_left_match.yaml

@@ -0,0 +1,5 @@
+---
+type: fix
+pr: 2175
+title: "When expanding a ValueSet using a filter, now evaluates the display with left-matching 
+   by string token, case-insensitive."

hapi-fhir-jpaserver-base/src/main/java/ca/uhn/fhir/jpa/dao/r4/FhirResourceDaoValueSetR4.java

@@ -211,9 +211,6 @@ public class FhirResourceDaoValueSetR4 extends BaseHapiFhirResourceDao<ValueSet>
 		for (int idx = 0; idx < theContains.size(); idx++) {
 			ValueSetExpansionContainsComponent next = theContains.get(idx);
 			
-			// e.g. For a display text of “Body height”:
-			// searching on "Bo" or "he" should find it
-			// searching on "ei" or "dy" should not find it
 			if (isBlank(next.getDisplay()) || !StringUtil.isStartsWithIgnoreCase(next.getDisplay(), theFilter)) {
 				theContains.remove(idx);
 				idx--;