use re 'debug';
$_="abc def";
#$_= qq!"abc def$"!;

if (/"^abc[A\b]def$"/ ){
    print "\ntrue\n";
}
else
{
    print "\nfalse\n";
}
__END__
Compiling REx `"^abc[A\b]def '
size 19 Got 156 bytes for offset annotations.
first at 1
   1: EXACT <">(3)
   3: BOL(4)
   4: EXACT <abc>(6)
   6: ANYOF[\10A](17)
  17: EXACT <def >(19)
  19: END(0)
anchored ""abc" at 0 (checking anchored) minlen 9
Offsets: [19]
        1[1] 0[0] 2[1] 3[3] 0[0] 6[5] 0[0] 0[0] 0[0] 0[0] 0[0] 0[0] 0[0] 0[0] 0[0] 0[0] 11[4] 0[0] 15[0]

false
Freeing REx: `"\"^abc[A\\b]def "'