My Test Plan (not working):
+ WebSocket Sampler
- Regular Expression Extractor
My Regular Expression:
Response data:
[Message 1]
0{"sid":"1BdTy3e4-jfrVM67AAAR","upgrades":[],"pingInterval":25000,"pingTimeout":60000}
How to get 'sid' ?
Regular expression "sid":"(.+?)"
is ok.
Try use Match no(0 for Random) = 1
For Regex test see here https://regex101.com/r/yW4oR3/1