dynamic path regex

[Dexus]

Hello,

when I try to use regex like:

app.Get("/map/{lat:string regex(^[-]?[0-9]+(\\.[0-9]{1,5})) else 404}/{lon:string regex(^[-]?[0-9]+(\\.[0-9]{1,5})) else 404}", func(ctx iris.Context) {
...
})

I get can't get the route.
Also if i use something with $ at end of the regex it said it's an illegal token.

[Zeno-Code]

if you need else in route
use app.Macros() Make filtering and restrictions
app.Macros().String.RegisterFunc("youpathfun", fn)
https://github.com/kataras/iris/tree/master/_examples/routing/dynamic-path

[kataras]

Hello @Dexus,

First of all you use wrong string function for regexp, it's regexp no regex as shown at the examples and the README.md itself:P

Secondly, I think the expression of ^-?[0-9]{1,3}(?:\\.[0-9]{1,10})?$ would be more correct, but you know better.

Thirdly, the else 404 is not necessary, the router will fire 404 automatic if the parameters are not evaluated by the custom path evalutator(macro parameter func), use else for other status codes like else 500.

However do it like @Zeno-Code says, using macro functions is much more re-usable and more customized, regexp is a macro func of String type too! Just look here.

A full example for you

import "regexp"
// ...
// func main...

latLonExpr := "^-?[0-9]{1,3}(?:\\.[0-9]{1,10})?$"
latLonRegex, err := regexp.Compile(latLonExpr)
if err != nil {
	panic(err)
}

app.Macros().String.RegisterFunc("coordinate", func() func(paramName string) (ok bool) {
	// MatchString is a type of func(string) bool, so we can return that as it's.
	return latLonRegex.MatchString
})

app.Get("/coordinates/{lat:string coordinate() else 502}/{lon:string coordinate() else 502}", func(ctx iris.Context) {
	ctx.Writef("Lat: %s | Lon: %s", ctx.Params().Get("lat"), ctx.Params().Get("lon"))
})

Request example: http://localhost:8080/coordinates/37.983810/23.727539

---

Happy coding!

[Dexus]

@kataras Damn it! Thanks for the tip. Sometimes I can't see the forest because of the trees. 🙄