VCL using local variable in regular expression

June 27, 2018 09:21

Hello,

I want to replace regexp used several times in my vcl by a local variable.

declare local var.regexp STRING;
set var.regexp = "^(BE|FR|NL)$";

if (client.geo.country_code ~ var.regexp) {
  # do stuff
}

But I have an error :

Syntax error: Expected `STRING` expression
at: (input Line 937 Pos 31)
if (client.geo.country_code ~ var.regexp) {
------------------------------###########---

Is it possible to do regexp with local var ?

Regards

Mathieu

Comments

4 comments

Andrew Betts

June 27, 2018 09:41
Hi Mathieu,

Sadly not. I'd love to say that we support dynamic regexs but unfortunately they have to be string literals. In the case of this particular pattern, you're just testing for membership of a set, which I would recommend that you do with a table. You can do that like this:

```

Outside of any subroutine / or in an 'init' snippet

table countries { "BE": "Belgium", "FR": "France", "NL": "Netherlands" }

In vcl_recv

if (table.lookup(countries, client.geo.country_code)) { # do stuff } ```

You can of course use the table.lookup function repeatedly to reference the same country list.
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messenjer

July 11, 2018 14:29
Great !

Thanks Andrew !
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Ichi

July 07, 2022 17:31

This variable may works better on this case.

declare local var.list-of-countries STRING;
set var.list-of-countries = "BE, FR, NL";
if (std.strstr(var.list-of-countries, client.geo.country_code)) {
  # do stuff
}

I create a fiddle, please take a look at here

Cheers

messenjer

July 07, 2022 18:36
Thanks, it's even easier that way !
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Outside of any subroutine / or in an 'init' snippet

In vcl_recv