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s/(\p{Han}+?)\((\p{Hiragana}+?)\)/\\ruby{\1}{\2}/g;

use utf8; 
binmode DATA, ':encoding(UTF-8)';
...
__DATA__
This is English text with 日本語(にほ&#1
+2435;ご) mixed in. To test multi-furi text: 繰(く)&
+#12426;返(かえ)し 
# should lead to \ruby{繰}{く}り\ruby{返}{&#12
+363;え}し.