| | Regular expressions 5. Special control characters | 
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Special control characters in a regular expression specify characters that are difficult to type.
- \a  alert (bell).
- \b  backspace.
- \e  ASCII escape character.
- \f  form feed (new page).
- \n  newline.
- \r  carriage return.
-    Example : a search for "\r\n" followed by a replace "\r" changes Windows text files to Macintosh text files.
-    Example : a search for "\r" followed by a replace "\n" changes Macintosh text files to Unix text files.
-    Example : a search for "\r\n" followed by a replace "\n" changes Windows text files to Unix text files.
- \t  horizontal tab.
- \v  vertical tab.
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