{phone.number -> v:format.substring(start: '0', length: '3') -> f:variable(name: 'countryCode')} {phone.number -> v:format.substring(start: '3', length: '1') -> f:variable(name: 'firstZero')} {phone.number -> v:format.substring(start: '4') -> f:variable(name: 'remainingNumber')} {countryCode} {firstZero}{remainingNumber}