Is it possible to use regular expressions in a function node?

Questions
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1

Hello,
I have the next code:

let validationRangeOfDates = valueOfCurrentItem.match(/(\d{1,4}([.\-/])\d{1,2}([.\-/])\d{1,4})/g);

Being valueOfCurrentItem a string with values as “Ok 10/01/2022 to 14/10/2022”

I use this regular expresion to recover the dates from the string to an array.
The error is the next:

TypeError: valueOfCurrentItem.match is not a function
    at C:\Users\Interacso\AppData\Local\Programs\n8n\resources\app\node_modules\n8n-nodes-base\dist\nodes\Function:27:38
    at Object.<anonymous> (C:\Users\Interacso\AppData\Local\Programs\n8n\resources\app\node_modules\n8n-nodes-base\dist\nodes\Function:70:2)
    at NodeVM.run (C:\Users\Interacso\AppData\Local\Programs\n8n\resources\app\node_modules\vm2\lib\main.js:1233:29)
    at Object.execute (C:\Users\Interacso\AppData\Local\Programs\n8n\resources\app\node_modules\n8n-nodes-base\dist\nodes\Function\Function.node.js:95:31)
    at Workflow.runNode (C:\Users\Interacso\AppData\Local\Programs\n8n\resources\app\node_modules\n8n-workflow\dist\src\Workflow.js:524:37)
    at C:\Users\Interacso\AppData\Local\Programs\n8n\resources\app\node_modules\n8n-core\dist\src\WorkflowExecute.js:447:62

Is it possible to use regular expressions in a function node?

Thank you very much for your time!
BR!

2

Hey @franchogarcia, I gave this a quick go on my end, but did not run into the problem you have described:

image

I’ve attached my example workflow below for reference:

Example Workflow

Is there a chance valueOfCurrentItem might not be the expected string for some of the items you’re processing?

3

Hello MuteJam!
First at all, thank you very much for your quick answer.
Regarding to your question, perhaps you are right and some value might not be the expected string. I am using the desktop version and yet I have not idea about how copy/paste workflows there and debug the source code of functions node. Normally with something as console.log would be enough jejeje
Could you recommend me how I can debug or to use console.log in desktop n8n version?

Again thank you very much for your time.
BR!

4

Hey @franchogarcia, as for copying and pasting the workflow you should be able to simply copy the workflow’s JSON code here from the forum and paste it into your n8n canvas using Ctrl+V.

As for debugging: console.log() is also my preferred way of doing this :smile:. To avail of this functionality, you can open the browser console right in the desktop app using the respective keyboard combination (Ctrl+Shift+I on Windows):

image
image1920×1033 65.9 KB

If that doesn’t work for any reason you can also access http://localhost:5679 in a browser of your choice and open the UI in there. The username and password required can be viewed via the desktop app’s Auth menu:
image

1 Like
5

Good morning @MutedJam!!
Thank you very much for your time and support!! Your solutions have been very usefull!!
Thanks a lot!!
I am starting to love n8n!

BR!

1 Like
6

Nice, glad to hear this worked for you!

1 Like