Simplifying retry-after parser patterns

Author: LikeTheSalad

opamp-client/src/main/java/io/opentelemetry/opamp/client/internal/connectivity/http/RetryAfterParser.java

@@ -15,10 +15,10 @@
 
 public final class RetryAfterParser {
   private final SystemTime systemTime;
-  public static final Pattern SECONDS_PATTERN = Pattern.compile("^\\d+$");
-  public static final Pattern DATE_PATTERN =
+  private static final Pattern SECONDS_PATTERN = Pattern.compile("\\d+");
+  private static final Pattern DATE_PATTERN =
       Pattern.compile(
-          "^([A-Za-z]{3}, [0-3][0-9] [A-Za-z]{3} [0-9]{4} [0-2][0-9]:[0-5][0-9]:[0-5][0-9] GMT)$");
+          "[A-Za-z]{3}, [0-3][0-9] [A-Za-z]{3} [0-9]{4} [0-2][0-9]:[0-5][0-9]:[0-5][0-9] GMT");
   private static final DateTimeFormatter DATE_FORMAT =
       DateTimeFormatter.ofPattern("EEE, dd MMM yyyy HH:mm:ss z", Locale.US);