@U8MJBRSR5 lot of parsers in 3rd party libs, using s/form. As a sample, one parser and a spec visitor in spec-tools (https://github.com/metosin/spec-tools).

Also a issue to have a spec walker in the core: https://dev.clojure.org/jira/browse/CLJ-2251

thank you

I don’t have a running repl atm, but I think you can use (coll-of char? :kind string?)

It works, thanks. Need to add :into [] to keep the chars order at conform time.

I still have trouble afterward … I would like to run some regex spec (e.g. s/cat) on the content of a string but without having to apply s/conform on the seq of that string. I don’t know if it is possible.

FWIW, the general advice I’ve seen is that spec is not a great fit for parsing strings. Certainly people have done it by turning the string into a sequence with seq, but often people run into further issues. More detail in comments here: https://www.reddit.com/r/Clojure/comments/7vwpu4/parsing_with_clojurespec/

YMMV of course

TL;DR : https://clojuredocs.org/clojure.spec.alpha/conformer …with a nice example under the documentation.

A good discussion of pitfalls with conformers and how to work around them: https://groups.google.com/d/msg/clojure/Tdb3ksDeVnU/LAdniiZNAgAJ

“we recommend that you not use conformers for coercion. Conformers were added primarily as a tool for building custom composite spec types”

I know people have had success with using spec for parsing strings, just wanted to make you aware of possible issues down the road 🙂

if you run into them, it may be worth looking at something like https://github.com/cgrand/regex

Ah, Christophe again :-)