To indicate where a variable ends in a regex, you surround the variable with {}: $string =~ m/${match}{$repeat}/;.

That keeps it from thinking you mean %match, but gives you m/Hello{2}/ (match "Hell", followed by two "o"s). To make the repeat apply to the whole $match, you need to group it: m/(?:${match}){$repeat}/, which makes the added {} unnecessary, leaving you with m/(?:$match){$repeat}/.

In reply to Re: Regex curly bracket ambiguity by ysth
in thread Regex curly bracket ambiguity by Anonymous Monk

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