Question

Consider this:

my $var = "${SOME_VAR}"

my $string "In this text ${SOME_VAR} will be replaced with X"

$string =~ s/$var/X/g;

print "\nprocessed string = <".$string.">";

returns

processed string = <In this text ${SOME_VAR} will be replaced with X>

i.e. the replace does not take place.

However, if $var does not contain a reserved character ($), the replace DOES take place:

my $var = "SOME_VAR"
/* everything else the same */

returns

processed string = <In this text ${X} will be replaced with X>

But I do not know how to escape reserved characters when they are contained within a variable, i.e. when the search token is not explicit but parametarized.

Any idea?

Thanks

Answer 1

Your string contains $ which has a special meaning.. You can use \Q and \E to get it work..

$string =~ s/\Q$var\E/X/g;

\Q disables pattern metacharacters until \E