How to extract sessionKey from the below response using Jmeter?
<iframe frameborder="0" scrolling="no" src="https://hpc.uat.freedompay.com/api/v1.2/controls?sessionKey=eyJhbGciOiJBMjU2R0NNS1ciLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiaXYiOiJ3QWRBa0pYZHRFZjRJZ0FyIiwidGFnIjoiYnkza094VWcteTNMSVdGZXpwRXVZZyIsInppcCI6IkRFRiJ9.UyZuzOJjUUH_W4Y8562QQEE3sMInJBC5nbBw_iROmlT307ij_HpVTHIkkTGOYtjJ3fqqj98xrg6mmFQAYUvCMw.BK539lfAMdXR1W08rDGSew.W8fNSXnjy85FFMVBunjYJ81pTwhDxoNLfBAyh4xsr2442LYTxu_C8r4BsYrASO6cq1cN73K7IAOz-77fc17Vw49eb61wo8urEacXUcT8i8jy7fq4TrTqFq3YLgjiE-1Q8ytn9T9hKSrPIOABFhy69th4SpvHKTJ6qVSz1ZmQ6Df3jKVmL4CUXrqqLrSRuDg-0jFChqIjSROI8q-ZBfBoZxUZ6GWsek4GiLa21nWZHHeIB2yAMAX1c4oTQJr3kcKcslIlIKtRHGQYF2V9lDrnZflViY6a1ZzzAoNAK9avjEn3tK-mFLiBRzTxastq-TbfnFao5b1UVhVVx4woCIwgKw-WYl69x91dO6oPHexUTnfrd5J86zqQGZXzAwuA7E1tt1WJSz720mRfSFwduuF_8uisTHYPuAXC36y9n1fgQ3C0S6gbeVj9Hm1LpUuRgX81tYVIRb8EpZEaAcizp1TbEA.kZogTE6vDXDhIEO2joVCRC6FY3URy4aWcIqB7E2i4_k"></iframe>