How can I extract specific text from logs?

[ppanchal]

Below is my sample log,

05:59:26,173 INFO  [LoggingAspect] (ajp-/10.248.156.65:8909-11)  User Logged : vleeladh into the method : saveFilters with Parameter : {"userId":"vleeladh","tier":"[]","marketarea":"[]","businessunit":"[]","site":"

I want to extract the userId (vleeladh) from the log.

Can someone please assist me?

[woodcock]

Like this:

... | rex "{\"userId\":\"(?<userId>[^\",]+)"

[somesoni2]

Try like this

your base search | rex "\"userid\":\"(?<userId>[^\"]+)"