Possible bug in the Identifier regex?

[dave-addition]

Describe the bug

In section 2.4 (code, live) there is a regex for valid Identifiers:

/[A-Za-z_][a-za-z_0-9]*/

This looks strange, because [a-za-z] is equivalent to [a-z]. In addition, we're actively running GROQ queries against Sanity which use camelCase identifiers.

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Is it possible that this regex is meant to be /[A-Za-z_][A-za-z_0-9]*/?