rex extract

[jenkinsta]

Value session_value containg this info:

not found, name: user@mycompany.com more text here 

Trying to use this:
rex field=session_value ":(?<session_value>)@"

To extract: user

I think I am close, anyone assist? 

[richgalloway]

Yes, it's close.  regex101.com can tell you that, too.  Try this:

| rex field=session_value ": (?<user>[^@]+)@"