'Some patterns causing TypeError in model-json-js

I am trying to use a Json schema to validate a JSON model

I have installed node module model-json-js

One property is using a pattern to try and match the expression. Using 0-9 does not cause any errors.

properties: {
    test: {
        type: "string",
        pattern: "^[0-9]*$"
    },

but using the same pattern, but [a-z] does cause an error

properties: {
    test: {
        type: "string",
        pattern: "^[a-z]*$"
    },

Uncaught TypeError TypeError: Cannot read properties of undefined (reading 'validate')
    at validate (/Users/dave/Documents/Projects/playground/json-model/node_modules/model-json-js/dist/Model.js:1:1942)

I've tried escaping, but cannot find a format that works using letters. What am I doing wrong?

json jsonschema

Solution 1:^[1]

Sorry, the problem was not in the regex expression, it was in the starting value of the model, not matching the regex expression. The error doesn't get caught in my try/catch, it crashes in the module when the model is being built but at least I don't have to relearn regex to get this working...

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Solution 1	macasas

'Some patterns causing TypeError in model-json-js

Solution 1:[1]

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Solution 1:^[1]