replace \\ with \ using stringByReplacingOccurrencesOfString 
<p>I use code blow to replace \\ with \</p>

<pre><code> NSString *str =@"\\u597d\\u6f02\\u4eae\\u7684\\u5a5a";

 str=    [str  stringByReplacingOccurrencesOfString: @"\\\\" withString: @"\\" ]; 
</code></pre>

<p>but it looks like stringByReplacingOccurrencesOfString does not work.
Both of them output </p>

<pre><code> \u597d\u6f02\u4eae\u7684\u5a5a
</code></pre>

<p>Welcome any comment</p>
