Method scanPythonNamedBackref

syntax/parser.go:947–972

()

}

func (p *parser) scanPythonNamedBackref() (*RegexNode, error) {
	p.moveRight(3)
	if p.charsRight() == 0 {
		return nil, p.getErr(ErrMalformedNameRef)
	}

	ch := p.rightChar(0)
	if !p.isGroupNameStartChar(ch) {
		return nil, p.getErr(ErrInvalidGroupName)
	}

	capname, err := p.scanCapname()
	if err != nil {
		return nil, err
	}

	if capname == "" || p.charsRight() == 0 || p.moveRightGetChar() != ')' {
		return nil, p.getErr(ErrMalformedNameRef)
	}

	if !p.isCaptureName(capname) {
		return nil, p.getErr(ErrUndefinedNameRef, capname)
	}

	return newRegexNodeM(NtRef, p.options, p.captureSlotFromName(capname)), nil
}

// scanGroupOpen scans chars following a '(' (not counting the '('), and returns
// a RegexNode for the type of group scanned, or nil if the group