JavaScript, 38 bytes

f=s=>/(\D+)(\d+)(.+)/.exec(s).slice(1)

Example:

f("UK7898S14")
// ["UK", "7898", "S14"]

f("cphDK1234CYELLOWS14QGOOD")
// ["cphDK", "1234", "CYELLOWS14QGOOD"]

JavaScript, 38 36 bytes

s=>/(\D+)(\d+)(.+)/.exec(s).slice(1)

Example

const f =

s=>/(\D+)(\d+)(.+)/.exec(s).slice(1)

console.log(f("UK7898S14"));
console.log(f("cphDK1234CYELLOWS14QGOOD"));

JavaScript, 36 bytes

f=s=>/(\D+)(\d+)(.+)/.exec(s).slice(1)

Example:

f("UK7898S14")
// ["UK", "7898", "S14"]

f("cphDK1234CYELLOWS14QGOOD")
// ["cphDK", "1234", "CYELLOWS14QGOOD"]

JavaScript, 38 bytes

f=s=>/(\D+)(\d+)(.+)/.exec(s).slice(1)

Example:

f("UK7898S14")
// ["UK", "7898", "S14"]

f("cphDK1234CYELLOWS14QGOOD")
// ["cphDK", "1234", "CYELLOWS14QGOOD"]