Write statements to accomplish each of the following tasks:

Question

a) Create a regular expression to match either a five-letter word or five-digit number.
b) Create a regular expression to match a phone number in the form of [phone].
c) Create a shared_ptr to the int 5 called intPtr.
d) Create a weak_ptr to intPtr called weakIntPtr.
e) Access the int’s value using weakIntPtr.

Answer 1

a) ```
boost::regex( "\\w{5}|\\d{5}" );
```
b) ```
boost::regex( "\\(\\d{3}\\)\\s\\d{3}-\\d{4}" );
```
c) ```
boost::shared_ptr< int > intPtr( new int( 5 ) );
```
d) ```
boost::weak_ptr< int > weakIntPtr( intPtr );
```
e) ```
boost::shared_ptr< int > sharedIntPtr = weakIntPtr.lock();
*sharedIntPtr;
```