fix(schema) - Use ASCII characters for \w in pattern regex

[kddejong]

Issue #, if available:

Description of changes:

• \w, \W, \b, \B, \d, \D, \s and \S flags in regex should be ASCII based not unicode
• Unicode is the default in python so this switches it to be ascii based

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[kddejong]

More details: https://docs.python.org/3/library/re.html#re.ASCII https://262.ecma-international.org/5.1/#sec-15.10.2.12 http://json-schema.org/understanding-json-schema/reference/regular_expressions.html