Variable validate`Const`

validate: (expr: string) => boolean = ...

Check whether a cron expression is syntactically valid without throwing.

Type Declaration

- (expr: string): boolean
- Validate a cron expression without throwing.
  Parameters
  - expr: string
    The cron expression to validate.
  Returns boolean
  true if valid, false otherwise.
  Example
```
parser.validate( '0 9 * * MON' );  // true
parser.validate( '99 * * * *' );   // false
```