Hi Phillipa,

Thanks for the question. One way to do this would be to use the Tokenise/Detokenise blocks. I've posted an example below:

Lets say we have some data as follows:



We want to replace value "FFF" with "BBB" in the "Tags" field. Firstly we use a De-Tokenise block to create a separate record for each token:



Then we use a Search/Replace block to replace the "FFF" tag with "BBB":



Now the values are in the wrong order, so we use a Sort block to ensure they are the right order. Note: We must select "Id" field as well as the "Tags" field to ensure the Id order is retained:



Finally to get the data back to it's original format we can use the "Tokenise" block:



So we have replaced one of the values and re-sorted the values back to alphabetical order.

Hope this helps.

Chris