如何在任何特殊字符之前添加额外的空格

Question

how to add extra spaces before any Special character in string,in Swift, for example if i have string

var str = "#StackOverFlow@is$awesome"

 " #StackOverFlow  @is  $awesome"   // i have to achieve this...add empty spaces before every # 

how can we solve and achieve this in Swift

Answer 1

You can use a regular expression to match any special character "[^\\w]" which means any non word character and replace by the same match "$0" preceded by white spaces. If you would like to exclude whitespaces from being replaced you can use "[^\\w|\\s]" :

let str =  "#StackOverFlow#is#awesome"
let result = str.replacingOccurrences(of: "[^\\w]",
                          with: "   $0",
                          options: .regularExpression)


print(result)  // "   #StackOverFlow   #is   #awesome\n"

---

let str2 =  "•StackOverFlow•is•awesome"
let result2 = str2.replacingOccurrences(of: "[^\\w]",
                          with: "   $0",
                          options: .regularExpression)


print(result2)  // "   •StackOverFlow   •is   •awesome\n"