Yaml syntax highlighting broken on "/"

Summary

The syntax highlighting is broken for YAML files when there are slashes (/) in the keys.

Steps to reproduce

Open the link in example project and compare line 25 to lines 20, 17, etc.

Example Project

https://gitlab.com/nicofrand/yaml-syntax-hl/blob/bfea510c0aa2b9b98a60cf2fe2ae31cd2ec292cf/syntaxic-hl.yml#L25

What is the current bug behavior?

The key appears in pink.

What is the expected correct behavior?

The key appears in green.