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Split string at every Uppercase character in Javascript

To split a string on capital letters, call the split() method with the following regular expression - /(?=[A-Z])/. The regular expression uses a positive lookahead assertion to split the string on each capital letter and return an array of the substrings.

const str = 'OneTwoThree';

const result = str.split(/(?=[A-Z])/);

// 👇️ ['One', 'Two', 'Three']

js split string on capital letter second

'ThisIsTheStringToSplit'.split(/(?=[A-Z])/); // positive lookahead to keep the capital letters


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