Regex Conversion From Javascript to Java

I am working on client-server application in java, (converting some code from java-script). I am struck. In java i am sending values to server by embedding in namevaluepairs. But after putting values i am getting empty json in java, which is working in javascript (values sending via GET using web forms ).

Here it javascript form statement:

<input type="text" name="criteria" value= 'Email=="wei.wang_zh@pcstars.com"'>

and here is java namevaluepair statement in which i am getting issue:

nameValuePairs.add(new BasicNameValuePair("criteria", "'Email==\"wei.wang_zh@pcstars.com\"'"));

I have tried to put string in a String data type, which is also not working. Here it is

String val="wei.wang_zh@pcstars.com";
    nameValuePairs.add(new BasicNameValuePair("criteria", "'Email==\""+val+"\"'"));

Please let me know what mistake i'm doing in both cases. Thanks