Function maskNumber

maskNumber(text, allowNegative?): string
Return only numbers
Parameters
- text: string
  The input text
- allowNegative: boolean = true
  Whether to allow negative numbers (default: true)
Returns string
Example
```
// returns 123
maskNumber('ab12cd3')
```
Example
```
// returns -123
maskNumber('abc-123')
```
Example
```
// returns -123456
maskNumber('abc-123-456')
```
Example
```
// returns 123
maskNumber('abc-123', false)
```
- Defined in mask.ts:112