Splitting a string into characters, but keeping some together

I have this string: TF'E'

I want to split it to characters, but the '" character should join the character before it.

So it would look like this: T, F' and E'

>Solution :

You could use a regular expression to split the string at each position immediately before a new letter and an optional ':

var input = "TF'E'";
var output = Regex.Split(input, @"(?<!^)(?=\p{L}'?)");

output will now be a string array like ["T", "F'", "E'"]. The lookbehind (?<!^) ensure we never split at the start of the string, whereas the lookahead (?=\p{L}'?) describes one letter \p{L} followed by 0 or 1 '.