using System;
using System.Text.RegularExpressions;
class Program {
static void Main() {
string value = "I went to the store at the mall at seven thirty in a big huff.";
string[] lines = Regex.Split(value, @"\s(?=to\b|at\b|in\b)");
foreach (string line in lines) {
Console.WriteLine(line);
}
}
}
ICAgIHVzaW5nIFN5c3RlbTsKICAgIHVzaW5nIFN5c3RlbS5UZXh0LlJlZ3VsYXJFeHByZXNzaW9uczsKICAgICAKICAgIGNsYXNzIFByb2dyYW0gewogICAgc3RhdGljIHZvaWQgTWFpbigpIHsKICAgIHN0cmluZyB2YWx1ZSA9ICJJIHdlbnQgdG8gdGhlIHN0b3JlIGF0IHRoZSBtYWxsIGF0IHNldmVuIHRoaXJ0eSBpbiBhIGJpZyBodWZmLiI7CiAgICBzdHJpbmdbXSBsaW5lcyA9IFJlZ2V4LlNwbGl0KHZhbHVlLCBAIlxzKD89dG9cYnxhdFxifGluXGIpIik7CiAgICAgCiAgICBmb3JlYWNoIChzdHJpbmcgbGluZSBpbiBsaW5lcykgewogICAgQ29uc29sZS5Xcml0ZUxpbmUobGluZSk7CiAgICB9CiAgICB9CiAgICB9