The (...) is being interpreted as a regular expression group. Try:

$inputstring=~s/\Q$t/$r/;

[download]

The \Q quotes any special characters following it so they lose their special meaning, so your $t will be matched literally.

For details see quotemeta and perlre.

In reply to Re: replace not working as expected by Anonymous Monk
in thread replace not working as expected by digirent

Title:
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