find consecutive letters in a string:
console.log('aaaa bbbbb cccccc dd'.match(/([a-z])\1{3,}/g));
// ["aaaa", "bbbbb", "cccccc"]
// using \1 to refer to matched content in the first parentheses
Find consecutive letters in a string using regex [JS]
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转载自blog.csdn.net/u014510460/article/details/82448602
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