Doesn't recognize yaml syntax for regular expressions as valid.

Describe the bug

Valid YAML syntax for regular expressions reported as invalid (unknown tag)

Expected Behavior

Entries should not display an error.

Current Behavior

Entries are flagged as unknown tag

Steps to Reproduce

1. Create a file and ensure language is set to YAML.
2. Use the following yaml:

---

case-insensitive: !ruby/regexp "/George McFly/i" 
complex: !ruby/regexp "/\\A\"((?:[^\"]|\\\")+)\"/" 
simple: !ruby/regexp '/a.b/' 

1. Observe error listed under text !ruby/regexp -> Invalid Tag: <!ruby/regexp>

Environment

• Windows
• Mac
• Linux
• other (please specify)

[JPinkney]

It looks like the default built in schemas are broken, I’ve just filed an issue: https://github.com/redhat-developer/yaml-language-server/issues/356. Those ones are supposed to work out of the box

[vtcifer]

In quick testing, I get the same behaviour with explicit tags, that are defined within the spec, examples given in 2.23.

---
not-date: !!str 2002-04-28

picture: !!binary |
 R0lGODlhDAAMAIQAAP//9/X
 17unp5WZmZgAAAOfn515eXv
 Pz7Y6OjuDg4J+fn5OTk6enp
 56enmleECcgggoBADs=

This is certainly not extensive testing, but it appears that no tags are supported natively, and that all must be defined in yaml.customTags.