$text =~ s|\b($term)\b|<a href=x>$1</a>|ig;

Capturing your search term in case-insensitive mode still preserves the original case when you use the captured text in your replacement.

This matches on word boundaries, rather than the \W non-word characters you were using.

In reply to Re: substitution preserving capitilization by joealba
in thread substitution preserving capitilization by Anonymous Monk

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