diff --git a/src/Helper/Str.php b/src/Helper/Str.php
new file mode 100644
index 0000000..8b1704b
--- /dev/null
+++ b/src/Helper/Str.php
@@ -0,0 +1,71 @@
+<?php declare(strict_types=1);
+
+namespace Jcsp\Cache\Helper;
+
+use Swoft\Stdlib\Helper\Arr;
+
+class Str
+{
+
+    /**
+     * Format cache key with prefix and arguments.
+     */
+    public static function formatCacheKey(string $prefix, array $arguments, ?string $value = null): string
+    {
+        if ($value !== null) {
+            if ($matches = self::parseCacheKey($value)) {
+                foreach ($matches as $search) {
+                    $k = str_replace(['#{', '}'], '', $search);
+                    $value = self::replaceFirst($search, (string) self::dataGet($arguments, $k), $value);
+                }
+            }
+        } else {
+            $value = implode(':', $arguments);
+        }
+        return $prefix . ':' . $value;
+    }
+    /**
+     * Parse expression of value.
+     */
+    public static function parseCacheKey(string $value): array
+    {
+        preg_match_all('/\#\{[\w\.]+\}/', $value, $matches);
+        return $matches[0] ?? [];
+    }
+    /**
+     * Get an item from an array or object using "dot" notation.
+     *
+     * @param array|int|string $key
+     * @param null|mixed $default
+     * @param mixed $target
+     */
+    public static function dataGet($target, $key, $default = null)
+    {
+        if ($key === null) {
+            return $target;
+        }
+        $key = is_array($key) ? $key : explode('.', is_int($key) ? (string) $key : $key);
+        while (($segment = array_shift($key)) !== null) {
+            if ($segment === '*') {
+                if ($target instanceof Collection) {
+                    $target = $target->all();
+                } elseif (! is_array($target)) {
+                    return value($default);
+                }
+                $result = [];
+                foreach ($target as $item) {
+                    $result[] = self::dataGet($item, $key);
+                }
+                return in_array('*', $key) ? Arr::collapse($result) : $result;
+            }
+            if (Arr::accessible($target) && Arr::exists($target, $segment)) {
+                $target = $target[$segment];
+            } elseif (is_object($target) && isset($target->{$segment})) {
+                $target = $target->{$segment};
+            } else {
+                return value($default);
+            }
+        }
+        return $target;
+    }
+}
diff --git a/src/Register/CacheRegister.php b/src/Register/CacheRegister.php
index b5f8192..730cb33 100644
--- a/src/Register/CacheRegister.php
+++ b/src/Register/CacheRegister.php
@@ -2,7 +2,7 @@
 
 namespace Jcsp\Cache\Register;
 
-use Jcsp\Core\Helper\Str;
+use Jcsp\Cache\Helper\Str;
 use Swoft\Log\Helper\CLog;
 use Swoft\Stdlib\Helper\StringHelper;