CODEWITHSUNDEEP
javascriptregexstringecmascript-2018
MANICX100
MANICX100

Reputation: 1369

Split JS string regex upper followed by lowercase

I have a long javascript variable articles that I am trying to split where a lowercase character is immediately followed by an uppercase

Using regex I have tried:

var article2 = article2.split(/(?=[A-Z][a-z])/);

but only managed to split on every word

Upvotes: 1

Views: 264

Answers (2)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626937

Since your JS environment is ECMAScript 2018 compliant (see what regex features it supports), you may use lookbehinds:

.split(/(?<=[a-z])(?=[A-Z])/)

A (?<=[a-z]) pattern is a lookbehind that requires a digit immediately to the left of the current location and (?=[A-Z]) is a positive lookahead that requires a digit immediately to the right of the current location.

See the regex demo.

Upvotes: 1

Niladri Basu
Niladri Basu

Reputation: 10614

var article2 = "SplitJavaScriptString";

// you are doing this (include Small case & Upper case)
console.log(article2.split(/(?=[A-Z][a-z])/)); 

// is this what you want (exclude Small case & Upper case)
console.log(article2.split(/[A-Z][a-z]/).filter(e => e != ''));

Upvotes: 0

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