ruby - gsub variable regardless of case -

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i have following code set highlight parts of phrase word is. function regardless of case struggling syntax. believe need add /i somewhere, not know where.

params.fetch('phrase').gsub(params.fetch('word'),   '<span class="ko-highlight">' + params.fetch('word') + '</span>')

this should trick

params.fetch('phrase').gsub(/#{params.fetch('word')}/i, '<span class="ko-highlight">' + params.fetch('word') + '</span>')

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