parse/line.go
func (l *Line) Capture() string {
	if len(l.Comment) == 0 {
		return ""
	}
	matches := placeholderRegexp.FindSubmatch(l.Comment)
	if len(matches) < 2 {
		return ""
	}
	return string(matches[1])
}
func (l *Line) Capture() string {
	if len(l.Comment) == 0 {
		return ""
	}
	matches := placeholderRegexp.FindSubmatch(l.Comment)
	if len(matches) < 2 {
		return ""
	}
	return string(matches[1])
}
// Capture extracts the first placeholder value from the
// comments.