字符串前缀和后缀在Swift中用“：”分隔

Question

在Swift中我想提取前缀直到空格和后缀，直到空格都被“：”分隔。如果字符串之间的空格应该是下一行。 例如：

Apple: Fruit Tomato: Vegetable Iron: Material

结果需要

Apple: Fruit
Tomato: Vegetable
Iron: Material

请帮助

Answer 1

您可以使用正则表达式"(?<!:) "来替换前面没有冒号标点" "的空白":"次出现：

let string = "Apple: Fruit Tomato: Vegetable Iron: Material"
let pattern = "(?<!:) "
let result = string.replacingOccurrences(of: pattern, with: "\n", options: .regularExpression)
print(result)    // "Apple: Fruit\nTomato: Vegetable\nIron: Material\n"