^insert_regexes_here_of_any pre-learn and pre-evaluate rewrite regexes$>-> 
^the_rewrite_format_is_'from'_then_greater_dash_greater_then_'to'$>->
^if_you_don't_want_a_'to'_you_still_need_the_>->_or_else_nothing_will_happen
^__use^and_$_to_anchor_ends_>-> for_a_single_line_pattern.  Example:
frobnitz_singleline.*>->single-line rewrite ran OK.
^If_you_use_>-->_instead,_then_multi-line_(line-spanning)matching_is_done
frobnitz_multiline.*testpattern>-->multi-line rewrite ran OK.