Removing Values in One Variable That Exist in Another

Mafe Ortega

Hoping someone can help me with a Smart Values question.

I have two variables defined in my automation rule:

var X: "e5a9e2ce-3d34-47b2-bc03-078197c2a7cf", "c1466970-6196-4741-9425-237c3466b37d", "dc1603c3-6941-4003-a660-1f522f8d4b5f", "ee49ea67-3549-4733-a3d3-98b24c35f852"

var Y: "c1466970-6196-4741-9425-237c3466b37d", "ee49ea67-3549-4733-a3d3-98b24c35f852"

What I want to do is remove any values from var X that also exist in var Y.
Expected result:

var Z: "e5a9e2ce-3d34-47b2-bc03-078197c2a7cf", "dc1603c3-6941-4003-a660-1f522f8d4b5f"

Is there a way to do this using Smart Values in Jira automation or any other way to do it?

Bill Sheboy

Hi @Mafe Ortega 

There are a couple of ways to do this; let's try the one using a regular expression and the replaceAll() function.  First the answer and then how it works:

• action: create variable
  • name: varX
  • value: what you show above
• action: create variable
  • name: varY
  • value: what you show above
• action: create variable, to build a regular expression to remove the varY values
  • name: varRegEx
  • value: 

({{varY.remove("\"").split(", ").join("|")}})

• action: something that needs the values removed from varX

{{varX.remove("\"").split(", ").replaceAll(varRegEx, "").match("(.++)").asJsonString}}

 

How that works...

• Your variables contain double-quotation marks, and those must be removed to work with the later steps. We use the remove() function to do this, escaping the double-quotation mark for the removal.
• We need a regular expression to remove those values.  After we cleanup varY, we split() it into a list and join() it with pipe characters to make an expression such as: (A|B|C)
• Chaining those earlier operations, we now use replaceAll() which takes the regular expression and replacing any values found with an empty string
• The result of the replacement could leave empty spaces in the list, such as: E, , F, G.  And thus we add a match() function with a regular expression to only return non-empty results.
• Now we have the answer, although without the double-quotes. We can add those back with the asJsonString function; this could also be done with iteration.
• The result is a list of values. Please join or iterate them as needed for {{varZ}}

 

The other way do do this is with a regular expression to directly remove the values (using negative lookahead). I have observed inconsistencies using this with rules, so I recommend sticking with replaceAll() rather than trying to do this with a single match() expression.

 

Kind regards,
Bill