Is it possible to create a function that can accept numbers with dot separators?
Here are some examples:
func('100.000.002.333') // should pass
func('10') // should pass
func('20') // should pass
func('100') // should pass
func('20') // should pass
func('0100.000') // error
func('1000') // error
func('000.000') // error (leading zero)
func('100.000.') // error (trailing dot)
func('100.00.000') // error
func('.100.00.000') // error (leading dot)
custom playground
Implemented in a more concise and elegant way compared to the initial code snippet provided.
type Break<S extends string, P extends string = ""> =
| S extends `${infer A}${P}${infer B}` ?
B extends '' ? [A, B] : [A, ...Break<B, P>]
: S extends '' ? [] : [S]
type y = Break<'9_two_22_three', '_'>
// ^?
// type x = ["9", "two", "22", "three"]
type Numeral = 'I' | 'II' | 'III' | 'IV' | 'V' | 'VI' | 'VII' | 'VIII' | 'IX'
// One or two-digit numerals excluding zero as the first character
type PrimaryNum = `${Exclude<Numeral, 'I'>}${'' | Numeral}${'' | Numeral}`;
// Three-digit numeral
type SecondaryNum = `${Numeral}${Numeral}${Numeral}`;
type Validate<S extends string> =
| S extends 'I' ? 'I' // Special case: allow exact match for 'I'
: Break<S, '_'> extends [PrimaryNum, ...SecondaryNum[]] ? S : false
declare function customFunction<S extends string>(input: Validate<S>): S;
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