This bit of code will help you if you need to pull or retrieve data into a workflow variable that has come in via a delimited format.
Sometimes if you get data from lists, web services, databases or elsewhere, that comes to you in a delimited form. Either comma delimited, as in CSV files, or semi-colon delimited, as from some accounting systems or some other delimiter.
Notice that the first data entry field to fill is in the pattern. When doing a split, this is the delimiter. The character or characters that will be used to split a piece of text. The operation is "Split" and the Input text, I've simply typed in some text with the comma separating them.
The result of this needs to be stored in a Nintex Workflow collection variable. For more information on the collection variable, take a look at these :
Nintex Workflow 2010
Nintex Workflow 2013
SharePoint Server 2010
SharePoint Server 2013
If you want to learn more, take a look at this site, which is one that I go to often to if I need a refresher - RegExr: Learn, Build, & Test RegEx
I hope this explains a little on how to use Regular Expressions in your Nintex Workflows. If you have any questions, please free to post them in the comments section.