how to replace one substring with another in Objective C?

Question

I want to replace an NSString substring with another substring in Objective C.

I know how to locate the substring I want to replace:

        NSRange range = [string rangeOfString:substringIWantToReplace];
        NSString *substring = [string substringFromIndex:NSMaxRange(range)];

But when it comes to actually removing/replacing it, I'm a little confused. Do I follow the C++ method at Replace substring with another substring C++? Or the C method at how to replace substring in c?? There's a related question at Objective-C: Substring and replace, but the string in question is a URL, so I don't think I can use the answers.

Community · Accepted Answer · 2017-05-23 10:26:56Z

7

I think your answer is here Replace occurrences of NSString - iPhone: [response stringByReplacingOccurrencesOfString:@"aaa" withString:@"bbb"]; defenetly works on any string and URL also.

If your concern about percent-notation of url and you want to be sure it will be replaced properly, you can firstly decode string, replace, and then encode:

// decode
NSString *path = [[@"path+with+spaces"
    stringByReplacingOccurrencesOfString:@"+" withString:@" "]
    stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
// replace
path = [path stringByReplacingOccurrencesOfString:@"aaa" withString:@"bbb"]
// encode
path = CFURLCreateStringByAddingPercentEscapes(
                                               NULL,
                                               (CFStringRef)path,
                                               NULL,
                                               (CFStringRef)@"!*'\"();:@&=+$,/?%#[]% ",
                                               kCFStringEncodingUTF8 );

edited May 23, 2017 at 10:26

CommunityBot

11 silver badge

answered Jan 4, 2013 at 1:59

Daniil

5,8105 gold badges22 silver badges29 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Joel Derfner Over a year ago

Thank you! I meant actually that the string in the other question was a URL, where my string isn't. The answers in that question seem based on the fact that it's a URL. But anyway your answer gave me what I needed--thank you!

user990230 · Accepted Answer · 2013-01-04 02:03:35Z

3

This is how I check for a substring and replace/remove substrings from NSString:

if([titleName rangeOfString:@"&quot;"].location != NSNotFound) {
     titleName = [titleName stringByReplacingOccurrencesOfString:@"&quot;" withString:@"\""];
}

answered Jan 4, 2013 at 2:03

user990230

3075 silver badges13 bronze badges

2 Comments

Joel Derfner Over a year ago

Very helpful but the other answerer got here first so I had to give him credit--still, thanks so much.

user990230 Over a year ago

No Problem, just wanted to show how easy it is to do this task with Objective-C's inbuilt methods.

Collectives™ on Stack Overflow

how to replace one substring with another in Objective C?

2 Answers 2

1 Comment

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related