Remove stock regex validation for query search

src/main/java/com/danielbohry/stocks/controller/stock/StockController.java

@@ -29,17 +29,13 @@ public class StockController {
 
     private final StockService service;
 
-    private static final String ACCEPT = "^[a-zA-Z]+$";
-
     @GetMapping
     public ResponseEntity<List<Quote>> find(@RequestParam(value = "q", required = false) String query) {
-        if (query != null && !Pattern.matches(ACCEPT, query)) {
+        if (query == null) {
             return ResponseEntity.ok(emptyList());
         }
 
-        List<Quote> response = query == null
-                ? service.getAll()
-                : service.get(query);
+        List<Quote> response = service.get(query);
         return ResponseEntity.ok(response);
     }