\\*) in="${in#?}"; out="${out}\\\\"; continue;;
%*) in="${in#?}"; out="${out}%%"; continue;;
*) att="${in%%"${pfx}"*}"; att="${att%%%*}"; att="${att%%\\*}"
\\*) in="${in#?}"; out="${out}\\\\"; continue;;
%*) in="${in#?}"; out="${out}%%"; continue;;
*) att="${in%%"${pfx}"*}"; att="${att%%%*}"; att="${att%%\\*}"