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nf-core

My apologies if this has already been answered, but I'm trying to branch a channel with regex for a variable and I'm getting a linting error:

```            Channel
                .fromPath( included_primers )
                .branch {
                    match : it =~ /${params.primer_set}_*/
                }```
This gives the error `Unexpected input: '/'`

What is the syntax I'm supposed to use for this?

I have a branch elsewhere in this file that doesn't show the error, so I feel like it's due to the variable, but I'm willing to be corrected.

I noticed something similar and though it was due to the "slashy string" being disallowed by the new nextflow syntax, but according to the <https://www.nextflow.io/docs/latest/reference/syntax.html#string|docs> it's fine. 

Wondering if perhaps it's an actual bug <@U02NX4B43EU> 

Oh actually I see that the VSCode <https://www.nextflow.io/docs/latest/vscode.html#restricted-syntax|docs> note that slashy strings cannot be interpolated. 

The other docs should probably also have this note added 

In terms of a fix I _think_ you can just use a normal `"` string instead of the slashy one 

indeed slashy strings cannot be interpolated in the strict syntax

but a little known fact is that the regex doesn't have to use slashes, it can also be a regular string:
```it =~ "${params.primer_set}_*"```