Function compilePattern

compilePattern(pattern?: null | string, flags?: string): undefined | RegExp
Returns a regex that compiled by the given pattern
Parameters
- Optionalpattern: null | string
  the pattern to inspect
- Optionalflags: string
  any combination of flag values
Returns undefined | RegExp
a regex that compiled by the given pattern
Author
David Hsing
Example
```
compilePattern('[a-zA-Z0-9]+', 'g');
```