You seem to understand this already, but I thought I'd try to
make it clear for future readers of this thread: Why doesn't it work?
When you finish slashing away at the
$search string, what have you got?
Win8 Strawberry 5.8.9.5 (32) Sat 05/01/2021 17:03:44
C:\@Work\Perl\monks
>perl -Mstrict -Mwarnings -l
my $search = "x2\\.+\\x4";
print $search;
^Z
x2\.+\x4
^^
||
++----- backslash escaped literal period (one or more)
Unescaped, the . (dot) is a regex matching operator (see
perlre, perlretut). Escaped, it matches a literal
period, and there is no period to match in your example $text
string. The + quantifier matches one or more of the atom
before it, a literal period in this case.
Similar result if you pass the $search string through the
qr// regex object constructor.
Win8 Strawberry 5.8.9.5 (32) Sat 05/01/2021 17:14:10
C:\@Work\Perl\monks
>perl -Mstrict -Mwarnings -l
my $search = "x2\\.+\\x4";
my $rx_search = qr/$search/;
print $rx_search;
^Z
(?-xism:x2\.+\x4)
Update: Minor re-formatting for clarity/coherence.
Give a man a fish: <%-{-{-{-<
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