// https://github.com/facebook/hermes/blob/main/include/hermes/Regex/RegexBytecode.h
// https://github.com/facebook/hermes/blob/main/include/hermes/Regex/RegexOpcodes.def
// RegexBytecodeHeader
pub struct RegexBytecodeHeader {
// Number of capture groups.
u16 markedCount,
// Number of loops.
u16 loopCount,
// Syntax flags used to construct the regex.
u8 syntaxFlags,
/// Constraints on what strings can match this regex.
MatchConstraintSet constraints,
}