Win8 Strawberry 5.8.9.5 (32)  Thu 01/28/2021 14:55:21
C:\@Work\Perl\monks
>perl -Mstrict -Mwarnings

use Data::Dump qw(dd);

my $s = "parameter=TO_DATE('1900-01-01','YYYY-MM-DD')\n";
dd 'before:', $s;

$s =~ s/=(.*)/="\1"/;
\1 better written as $1 at - line 7.
dd 'after:', $s;

^Z
("before:", "parameter=TO_DATE('1900-01-01','YYYY-MM-DD')\n")
(
  "after:",
  "parameter=\"TO_DATE('1900-01-01','YYYY-MM-DD')\"\n",
)