[0675] Sed to use extended regular expressions.

Sed commands have been updated to use ERE, extended regular expressions, in the script. (-r)


Source:
( )	Defines a marked subexpression. The string matched within the parentheses can be recalled later (see the next entry, \n). A marked subexpression is also called a block or capturing group. BRE mode requires \\( \\).
https://en.wikipedia.org/wiki/Regular_expression#POSIX_basic_and_extended