String.prototype.split() with a regex with grouping ( parentheses ).

[BobStein]

Splitting a string normally leaves out the delimiters.

> "a and b or c".split(/and|or/)
["a ", " b ", " c"]

But grouping-parentheses in a regular expression preserves them in the odd-numbered indexes of the output.

> "a and b or c".split(/(and|or)/)
["a ", "and", " b ", "or", " c"]

This was not supported in IE before version 11. And MDN says "not all browsers support this capability." I'd like to see whether other browsers support this feature. But the current information in caniuse.com does not address this.

These methods are supported in effectively all browsers (since IE6+, Firefox 2+, Chrome 1+ etc)