[perlre] 4-digit hex code in regexp? How to specify?

[princepawn]

As you might be able to tell from the Basic Unicode Chart, a $ sign has hex value 0024. However, in Perl, I cannot write 0024, but must only write 24. This could problem problematic when dealing with a larger hex code than 2 digits. How can I specify a hex code in Perl using 4 digits instead of 2?

$delimiter = 'Y';

$_ = q(this has $100 worth of salt in it) ;

warn $_;

s/([\x0024])/$delimiter/gm;

warn $_;

s/([\x24])/$delimiter/gm;

warn $_;

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