3 examples of 'regex for decimal number' in JavaScript

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61function getRegex (isDecimal: boolean): RegExp {
62 return new RegExp(
63 isDecimal
64 ? `^(0|[1-9]\\d*)(\\${KEYS.DECIMAL}\\d*)?$`
65 : '^(0|[1-9]\\d*)$'
66 );
67}
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68function removeDecimal(num) {
69 const re = new RegExp('^-?\\d+');
70 return num.toString().match(re)[0];
71}
5public static validate(decimals: number): (control: FormControl) => { pattern: string } | null {
6 const regExpString: string = `^[0-9]+((\\.|,){1}[0-9]\\d{0,${decimals - 1}})?$`
7 const regExp: RegExp = new RegExp(regExpString)
8
9 return (control: FormControl): { pattern: string } | null => {
10 const stringAmount: string = new BigNumber(control.value).toFixed()
11 if (stringAmount.match(regExp) === null) {
12 return { pattern: 'Pattern does not match.' }
13 }
14
15 return null
16 }
17}

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