Datawave extract string using regexp - mule

Question

I'm trying to extract a part of a string using a regular expression:
\[CODE\] \((.*?)\)
Given the string [CODE] (ABC-212) Rest of the title this match (https://regexr.com/557qd)
I used this regexp in my current java application, and now I'm trying to transform this on a Mule App.
Reading the documentation I see that I need to use a Transform, so I setup like this:
%dw 2.0
output application/json
---
vars.subject match(/\[CODE\] \((.*?)\)/)
I stored the string on the var called subject.
Using that regexp on Mule, do not works.. but in my java application does. What I'm doing wrong ?

Answer 1

DataWeave doesn't seem to have a global search flag (the g at the end of the original regex). This means the regular expression has to match the entire string. You use the parenthesis to indicate capture groups that will be returned additionally to the matched string.
Script:
vars.subject match(/^\[CODE\] \((.*)\).*/)
Output:
[
"[CODE] (ABC-212) Rest of the title",
"ABC-212"
]

Answer 2

Match in DataWeave returns an array that contains the entire matching expression, followed by all of the capture groups that match the provided regex. And in your case "Rest of the title" was not matching as per per Regex provided by you.
%dw 2.0
output application/json
var subject="[CODE] (ABC-212) Rest of the title"
---
//Catch here is, Regex should be fully matching as per input,
{
matchesOnly:subject matches /(\[CODE\]) \((.*?)\)[\w\W]*/,
matchOnly: subject match /(\[CODE\]) \((.*?)\)[\w\W]*/
}