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var test = "test_1,some_2,foo,bar_4,"; console.log(test.replace(/(.*?)(?:_(\d))?,/g, "title: $1 ($2)\n")); test = "test_1,some_2,foo,bar_4"; console.log(test.replace(/(.*?)(?:_(\d))?(?:,|$)/g, "title: $1 ($2)\n"));

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