update 优化 RegexUtils#extractFromString 方法未匹配返回null不返回默认值问题

ruoyi-common/ruoyi-common-core/src/main/java/org/dromara/common/core/utils/regex/RegexUtils.java

@@ -21,7 +21,8 @@ public final class RegexUtils extends ReUtil {
      */
     public static String extractFromString(String input, String regex, String defaultInput) {
         try {
-            return ReUtil.get(regex, input, 1);
+            String str = ReUtil.get(regex, input, 1);
+            return str == null ? defaultInput : str;
         } catch (Exception e) {
             return defaultInput;
         }