Use the \Q...\E metacharacter-escape sequence. 
$n_src =~ s/\Q$s_text\E/[$i $s_text]/;

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japhy -- Perl and Regex Hacker

In reply to Re: Regex Question by japhy
in thread Regex to match 'A HREF=', quoting RE replacements (was: Regex Question) by dsb

Title:
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