Check email register

[coder]

I have one list email , i want check email registered or unregister twitter
If {"valid":false,"msg":"Email has already been taken. An email can only be used on one Twitter account at a time.","color":"red","taken":true,"blank":false}
Result 1 = Register
If {"valid":true,"msg":"Available!","color":"green","taken":false,"blank":false}
Result 2 = Unregister

Please view images
When email registered

When email unregister

This is file my code
0_1472966509842_regtwiter.xml

[support]

@coder

You can check if responcce contains "valid":true text.