Generate perl version-dependent regexps once, rather than every call to import.

diff --git a/lib/constant.pm b/lib/constant.pm
index 906b777..b3a2e65 100644 (file)
--- a/lib/constant.pm
+++ b/lib/constant.pm
@@ -4,7 +4,7 @@ use strict;
 use warnings::register;
 
 use vars qw($VERSION %declared);
-$VERSION = '1.17';
+$VERSION = '1.18';
 
 #=======================================================================
 
@@ -17,6 +17,11 @@ my %forced_into_main = map +($_, 1),
 
 my %forbidden = (%keywords, %forced_into_main);
 
+my $str_end = $] >= 5.006 ? "\\z" : "\\Z";
+my $normal_constant_name = qr/^_?[^\W_0-9]\w*$str_end/;
+my $tolerable = qr/^[A-Za-z_]\w*$str_end/;
+my $boolean = qr/^[01]?$str_end/;
+
 #=======================================================================
 # import() - import symbols into user's namespace
 #
@@ -32,7 +37,6 @@ sub import {
     my $multiple  = ref $_[0];
     my $pkg = caller;
     my $symtab;
-    my $str_end = $] >= 5.006 ? "\\z" : "\\Z";
 
     if ($] > 5.009002) {
        no strict 'refs';
@@ -56,7 +60,7 @@ sub import {
        }
 
        # Normal constant name
-       if ($name =~ /^_?[^\W_0-9]\w*$str_end/ and !$forbidden{$name}) {
+       if ($name =~ $normal_constant_name and !$forbidden{$name}) {
            # Everything is okay
 
        # Name forced into main, but we're not in main. Fatal.
@@ -70,7 +74,7 @@ sub import {
            Carp::croak("Constant name '$name' begins with '__'");
 
        # Maybe the name is tolerable
-       } elsif ($name =~ /^[A-Za-z_]\w*$str_end/) {
+       } elsif ($name =~ $tolerable) {
            # Then we'll warn only if you've asked for warnings
            if (warnings::enabled()) {
                if ($keywords{$name}) {
@@ -83,7 +87,7 @@ sub import {
 
        # Looks like a boolean
        # use constant FRED == fred;
-       } elsif ($name =~ /^[01]?$str_end/) {
+       } elsif ($name =~ $boolean) {
             require Carp;
            if (@_) {
                Carp::croak("Constant name '$name' is invalid");