I have a problem replacing tekst in a HTML file, I drilled it down to a few lines of code as follows: 
#!/usr/bin/perl
$inputstring=qq{startstring <strong>(substring)</strong> endstring};
$t=qq{<strong>(substring)</strong>};
$r=qq{<b>(substring)</b>};

$inputstring=~s/$t/$r/;
print $inputstring;


#The final string should be:

startstring<b>(substring)</b> endstring

[download]
But it isn't changed. When I remove the ( and ) the replacement works well, but I've no influence on the inputstring. So what I want to achive is that $t is handled as a "exact search string" and not as a to be interpreted regular expression. Help is very appreciated.

In reply to replace not working as expected by digirent

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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