How to extract the substring from a string

[febbi]

I want to extract the substring: "xenmobile" from string:  "update task to xenmobile-2021-11-08-19-created completed!", how can I get that?

[ITWhisperer]

| replace "xenmobile" WITH "" IN field

[isoutamo · Accepted solution]

| makeresults
| eval foo = "update task to xenmobile-2021-11-08-19-created completed!"
| rex field=foo "update task to (?<bar>[^-]+)"