Regex path matching issue

Hello,

I was looking at allowing different RegEx patterns in the url matching. RegEx test cases

I see in the test cases you only run tests with direct regex expressions and not strings. await server.get(/.*.txt/).thenReply(200, 'Fake file');

Tried to create a regex pattern via new RegExp(“some regex pattern string”) but I am having match issues.

const regExPattern = new RegExp(regExPatternString, 'g');
await server.get(regExPattern).thenReply(200, 'Fake file');

Any tips ?

_Originally posted by @chrisribe in https://github.com/httptoolkit/mockttp/issues/9#issuecomment-1158910337_

[pimterry]

Yes, it’s not possible to do query matching by regex right now. PRs very welcome though! It should be fairly easy to add a withQueryMatching(/regex/) matcher that would do what you want.

Alternatively, it might make sense to extend withQuery({ v: '1.0.0' }) to allow withQuery({ v: /1.0.[0-9]/ }), so you can provide regexes to match against individual query values, independent of the order.

If you’re interested in adding that, I’d suggest starting by writing a couple of tests for it, then exploring the existing matcher definition implementations you can find defined around here: https://github.com/httptoolkit/mockttp/blob/0d586c5336a659f788a6d65b4bf6d979b3cc29ae/src/rules/base-rule-builder.ts#L136-L144.

[chrisribe]

I did find this showing all query param matchers do not support RegEx at all 😦

query-matching.spec.ts