JoniRegularExpression does not work with character class escapes (\s, \w, etc) within character classes ([]) #1192
Description
Version: 1.5.8
You can reproduce this bug by trying to match the JSON string "e" with the pattern [\w]:
final String schemaData = """ {"$schema":"https://json-schema.org/draft/2020-12/schema","type":"string","pattern":"[\\\\w]"}"""; final JsonSchemaFactory factory = JsonSchemaFactory.builder(JsonSchemaFactory.getInstance(SpecVersion.VersionFlag.V202012)) .build(); final SchemaValidatorsConfig config = SchemaValidatorsConfig.builder() .regularExpressionFactory(JoniRegularExpressionFactory.getInstance()) .build(); final JsonSchema schema = factory.getSchema(schemaData, config); final String json = "\"e\""; for (ValidationMessage msg : schema.validate(json, InputFormat.JSON)) { System.out.println(msg.getMessage()); }The example code above should not print any output, but in practice it prints does not match the regex pattern [\w].
This is an issue caused by JoniRegularExpression replacing character class escapes with its own custom character classes.
So the pattern in the given example becomes [[a-zA-Z0-9_]], which does not match the JSON string "e".