OK I'm not good at Regex. I want to split with delimiter ' while keeping it. What I want as output is
(3) ["'", "TEST", "'"]
When I use:
"'TEST'".split(/(['])/g);
Instead I get:
(5) ["", "'", "TEST", "'", ""]
It's almost what I want except I also get 2 empty strings. Why ?
The regex seems to be overkill for this purpose. Something like this works:
"'TEST'".split("'").map(str => (str.length) ? str : "'");
// [ "'", 'TEST', "'" ]
You end up with two empty strings in your array because the first ' character separates an empty string at the beginning from the string TEST, while the second ' character separates the string TEST from another empty string at the end.
You can just use String.prototype.match() instead of String.prototype.split():
console.log("'TEST'".match(/'|[^']+/g));Make sure you check for a null return value from .match(), but that is only possible with this particular regular expression when applied to an empty string.
You could do the trick by using a positive lookahead and lookbehind:
> "'TEST'".split(/(?<=')(.+)(?=')/g)
["'", "TEST", "'"]
