Cannot save custom field extraction when using my own regex

[Julznova_]

Hey, 

I'm attempting to extract a field by using: 

(?<=cs4=)(.*\n?)(?=categoryTechnique)

It matches 100% of the results, also checked on a regex editor,  but I cannot hit the save button. It continues to be greyed out.


I've attempted to create a custom field in Settings > Fields > Field Extractions > Add New

For this source type, but that throws up errors.

Anyone give me a hand?

Thanks!

[venkatasri]

Hi @Julznova_ 

Following is the error, What are you trying to extract and any sample?

Error in 'rex' command: The regex '(?<=cs4=)(.*\n?)(?=categoryTechnique)' does not extract anything. It should specify at least one named group. Format: (?<name>...).