增加字符串倒序重复字符约束条件

basic-util/src/main/java/ink/wgink/util/string/WStringUtil.java

@@ -398,4 +398,26 @@ public class WStringUtil {
         return str.substring(0, unRepeatCharIndex + 1);
     }
 
+    /**
+     * 倒叙截取重复字段
+     *
+     * @param str
+     * @param repeatChar
+     * @param minRepeatCount
+     * @return
+     */
+    public static String cutContinuityRepeatCharDesc(String str, char repeatChar, int minRepeatCount) {
+        int repeatCount = 0;
+        for (int i = str.length() - 1; i >= 0; i--) {
+            if (str.charAt(i) != repeatChar) {
+                break;
+            }
+            repeatCount++;
+        }
+        if (repeatCount < minRepeatCount) {
+            return str;
+        }
+        return cutContinuityRepeatCharDesc(str, repeatChar);
+    }
+
 }