_validateStringToken

private fn

bool _validateStringToken(const(char)[]  src,  ref  JsonToken cur,
       out  JsonError err)

@safe

Validates a STRING token's escape sequences like the DOM parser does.

`src`	Full input (for error context).
`cur`	The STRING token to check.
`err`	Set when the token's content cannot be decoded.

true when the string content decodes cleanly.