Question $4$

Write an application that uses regular expressions to check for telephone numbers and email addresses in a text file provided by a user. The following functionality should be included.

The user should be able to select the file to check using a standard file open dialog box.

The file should be displayed in the GUI.

The telephone numbers and email addresses should be highlighted$/$emphasized in some way in the text.

An email address can be identified by a single @ symbol in the address; telephone numbers could be from any of the following formats:

$000-000-0000$

$000-0000000$

$0000000000$

$(000)000-0000$

$(000)0000000$

You may assume that the email addresses and telephone numbers are free standing, that is$,$ they do not have brackets $($or any other character$)$ around them.

See an example below.

HINT: Consider using the QTextDocument, and QTextCursor classes.