// An ErrorCode describes a failure to parse a regular expression.
type ErrorCode string

const (
	// Unexpected error
	ErrInternalError ErrorCode = "regexp/syntax: internal error"

	// Parse errors
	ErrInvalidCharClass      ErrorCode = "invalid character class"
	ErrInvalidCharRange      ErrorCode = "invalid character class range"
	ErrInvalidEscape         ErrorCode = "invalid escape sequence"

		{"EmptyEndText", Const, 0},
		{"EmptyNoWordBoundary", Const, 0},
		{"EmptyOp", Type, 0},
		{"EmptyOpContext", Func, 0},
		{"EmptyWordBoundary", Const, 0},
		{"ErrInternalError", Const, 0},
		{"ErrInvalidCharClass", Const, 0},
		{"ErrInvalidCharRange", Const, 0},
		{"ErrInvalidEscape", Const, 0},
		{"ErrInvalidNamedCapture", Const, 0},
		{"ErrInvalidPerlOp", Const, 0},
		{"ErrInvalidRepeatOp", Const, 0},