Generated regex cannot be used with unicode flag

[rbuetzer]

It appears to me that the regex patterns generated by zodToJsonSchema cannot always handle the regex unicode flag.

Steps to reproduce

Run the follwoing code (Example on StackBlitz)

const zodSchema = z.string().includes("@");
const jsonSchema = zodToJsonSchema(zodSchema);

const regex = new RegExp(jsonSchema.pattern, 'u');

Observed behavior

• A runtime error invalid identity escape in regular expression is thrown in the last line
• If new RegExp(…) is called without the u flag, no error is thrown

Expected behavior

No runtime error is thrown

Analysis

The generated JSON schema looks like this:

{
  "type": "string",
  "pattern": "\\@",
  "$schema": "http://json-schema.org/draft-07/schema#"
}

The problem is, that the @ is escaped.

The MDN docs on \ state:

Escape sequences like \:, -, \@ will be equivalent to their literal, unescaped character equivalents in regular expressions. However, in regular expressions with the unicode flag, these will cause an invalid identity escape error.

[StefanTerdell]

JFC I hate regex

Would adding an option to not escape special characters be a solution?

[StefanTerdell]

Try the new patternStrategy option if you run into this.