Capitalize First Letter Of Each Name after Hyphen "-" and Space " " - regex

Question

I'm currently using this String extension to Capitalize the letter of each word in a textField :
"happy sunshine" .toTitleCase() gives "Happy Sunshine"
extension StringExtension on String {
String toTitleCase() => replaceAll(RegExp(' +'), ' ')
.split(' ')
.map((str) => str.toCapitalized())
.join(' ');
String toCapitalized() =>
length > 0 ? '${this[0].toUpperCase()}${substring(1).toLowerCase()}' : '';
}
but I'd also like to Capitalize letters that come after a hyphen - with the same toTitleCase method
ex : "very-happy sunshine" .toTitleCase() would give "Very-Happy Sunshine"
Currently .toTitleCase() gives "Very-happy Sunshine" : (

Answer 1

I am sure a wizard with expert knowledge in regular expression can do this better but I think this solution solves your problem:
void main() {
print('happy sunshine'.toTitleCase()); // Happy Sunshine
print('very-happy sunshine'.toTitleCase()); // Very-Happy Sunshine
}
extension StringExtension on String {
String toTitleCase() => replaceAllMapped(
RegExp(r'(?<= |-|^).'), (match) => match[0]!.toUpperCase());
}
If you call the method a lot of times, you might consider having the RegExp as a cached value like:
extension StringExtension on String {
static final RegExp _toTitleCaseRegExp = RegExp(r'(?<= |-|^).');
String toTitleCase() =>
replaceAllMapped(_toTitleCaseRegExp, (match) => match[0]!.toUpperCase());
}

Answer 2

You can tweak your code as well. But I've used the same thing somewhere in my project so you can do something like this as well.
Working: First I'm creating an empty array looping through each character in a particular string and checking if space (" ") and hyphen ("-") are current_position - 1 then I'm making current_position to uppercase.
String capitalize(String s) {
String result = "";
for (int i = 0; i < s.length; i++) {
if (i == 0) {
result += s[i].toUpperCase();
} else if (s[i - 1] == " ") {
result += s[i].toUpperCase();
} else if (s[i - 1] == "-") {
result += s[i].toUpperCase();
} else {
result += s[i];
}
}
return result;
}