$query =~ s/$value/$replace/i;
The problem is that $value contains something like $Id, and the $ when interpreted as a regex means "match the end of the string", not "match a dollar sign". You can fix that by writing
s/\Q$value\E/$replace/i;
instead.
Fwiw this is how I'd solve the same task:
my @array_1 = ("\$Id_run_query=1", "\$name_run_query=xyz", "db_query_r
+un_query=select * from meter where metetid=\$Id and metername=\$name"
+);
my $query;
my %replace;
foreach(@array_1){
if (m/^db_query_run_query=(.*)/i){
$query = $1
}
elsif (/(\$\S+)_run_query=(.*)/) {
$replace{$1} = $2;
}
}
my $replace_re = join '|', map quotemeta, keys %replace;
$query =~ s/($replace_re)/$replace{$1}/ig;
print "===>$query\n";
The call to quotemeta does the same as \Q...\E in the regex.
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