Swift : Get substring with rangeOfString() function example

Problem :

You have a string and you want to get(extract) the sub string from start to {0} and from {1} to end. Ignoring the "just gave" sub string. How to do that?

 let str = "Hmmm!, {0} just gave {1} a nice gift."

Solution :

Use substringToIndex() function to the get sub string from the start to {0}. Use substringFromIndex() function to get sub string from {1} to end.

To the sub string position, use the rangeOfString() function calculate the position.

For example :

 let str = "Hmmm!, {0} just gave {1} a nice gift."
 let myTextBefore1 = str.substringToIndex(text.rangeOfString("{0}")!.startIndex) // "Hmmm!, "
 let myTextAfter2 = str.substringFromIndex(text.rangeOfString("{1}")!.endIndex) // " a nice gift"

Hope you find this tutorial useful.