How to search for work items that do not contain certain wording in the label Edited

[Graham Heslop]

I'm hoping someone can help me here. I'm trying to write a query that will return the opposite to the below query:

issueFunction in issueFieldMatch("project = MOR", "labels", "Chunk_")

I want the query to return every ticket where the labels dont contain "Chunk_". For reference, there are labels with Chunk_1, Chunk_2, Chunk_3 etc. 

[John Funk]

Hi Graham - Welcome to the Atlassian Community!

Take a look at this document and see the Labels section. 

https://support.atlassian.com/jira-software-cloud/docs/advanced-search-reference-jql-fields/