Allow ":" in user defined keyword names to support names like 'meta:license' and 'meta:enum'

[teq0]

What version of Ajv you are you using?
7.0.4

What problem do you want to solve?
jsonschema2md allows the use of additional keywords such as meta:enum to supply descriptive information to enrich the generated documentation. Adobe use this meta:* pattern in their own schemas, for example XDM.

Turning off strict mode allows these properties, but it would be nicer to be able to add these as user defined keywords while retaining strict validation for everything else. The regex currently used to validate new keyword names doesn't allow : characters.

What do you think is the correct solution to problem?
Change the KEYWORD_NAME regex used to validate keyword names to allow :, but not as the first character. Something like

/^[a-z_$][a-z0-9_$-:]*$/i

Will you be able to implement it?
Yes.

[epoberezkin]

Thank you - no objections :)

[teq0]

Where should I put the tests?

[epoberezkin]

Can be just an extension of this test, no need for a separate test probably: https://github.com/ajv-validator/ajv/blob/master/spec/keyword.spec.ts#L1089