Expression syntax validation

[Kimbo0o]

Is your feature request related to a problem? Please describe.

When implementing a new process, it is easy to make mistakes with the expression syntax. For example, entering {myVariable} or ${myVariable - ${myVariable2} into an expression field will result in runtime errors.

Describe the solution you'd like

I would like to receive feedback from the modeller while entering an expression. All text fields used for entering expressions should be validated. The result should be displayed below the text field, just as it is with duplicates in ID inputs.

[nikku]

@Kimbo0o You're on Camunda 7 I believe? In Camunda 8 you'll be able to enjoy advanced editor intelligence, something that could be built for C7 (EL-expressions), too:

[Kimbo0o]

Yes, I use Camunda 7. I have just tested the advanced editor for Camunda 8 and it would be great to have this feature in Camunda 7 as well.

[nikku]

Open for contributions; unlikely from our end to retro fit this ability into C7. There exists a parser for EL expressions (https://github.com/nikku/lezer-el) that you could use to kickstart such an integration.

[barmac]

We are open for contributions but it's rather unlikely we implement it on our own.