I posted in Stackoverflow asking for help in regexp to retrieve value from a JSON response:

{"payload":"eyJjaGFsbGVuZ2UiOiIwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAiLCJtaW5pbXVtTW9iaWxlVmVyc2lvbiI6MSwibm9uY2UiOiJPQ1dwdjkzSzRMSCtQM0FOQmJDM0NCcHRQMmtES1M5TFZPVGFpWU9wUXFFPSJ9","signature":"hlMKmwJt8f24jv6MluM0W+0Kzxo96XlfM1GDop3CHPgLnLFpLmJ9imHFeCCU5bedA4jREuuQ5Y9pY+AqU5qt5QHAjPrtFyT69PktV8B7e+i9tqXae8haIB5iQUD9ln2yjMPE3XfG8+4jHEnHv7x7dePKr4zRgRTRQj6ZbMBaFGt1nhrDexfwHTiGfwuMGuneHUsBeb/EHjaKyGcOoLNq1xjHijlYVb3C3RF+y04VraN3Pt1mfjG9O+3Jvt3cF1xL4nhQO93ZvZ6UU2a0x74PutXxhfoWaeMiZSG0nCBGVP8WNDil1V00cX1Darpp/Xti6RlJJO+CKESInoBMxIWWYw=="}