Remove part of a string before the first forward slash

Question

I have a string

NSString *str = @"xyz/en/ABOUT/hello";

I need to remove all characters before the first slash.

My output should be like this :

"/en/ABOUT/hello"

but I cannot simply replace @"xyz", because the contents before the first slash are dynamic.

`rangeOfString:` should help you find the first `/`, then use if the `rangeFound.location != NSNotFound`, you can use `substringFromIndex:`. — Larme, Oct 11 '17 at 10:14
I found another way NSArray *strArray = [urlString componentsSeparatedByString:@"/"]; urlString = [urlString stringByReplacingOccurrencesOfString:strArray[0] withString:@""]; — user6788419, Oct 11 '17 at 10:19
If `str = @"en/en/ABOUT/hello"`, it shouldn't work. `stringByReplacingOccurrencesOfString` would replace each one giving as result `@"//ABOUT/hello` — Larme, Oct 11 '17 at 10:21

score 3 · Accepted Answer · answered Oct 11 '17 at 14:07

Objective-C

NSString *str = @"xyz/en/ABOUT/hello";
NSUInteger index = [str rangeOfString:@"/"].location;
NSString *myString = [str substringFromIndex:index];
NSLog(@"final string: %@", myString);    // final string:  /en/ABOUT/hello

Swift3

let str = "xyz/en/ABOUT/hello"
let index = str.range(of: "/")?.lowerBound
let myString: String? = str.substring(from: index!)
print("final string: ", myString!)   // final string:  /en/ABOUT/hello

armnotstrong · Answer 2 · 2017-10-11T10:37:08.567

0

first split the string:

NSArray *array1 = [str componentsSeparatedByString:@"/"]

then join the string:

NSString *joinedString = [[array1 subarrayWithRange:NSMakeRange(1, [array1 count] - 1)] componentsJoinedByString:@"/"];

to add the first '/' back

joinedString = [@"/" stringByAppendingString:joinedString]

There should be a regex way of doing this, but rarely using that unless have to.

edited Oct 11 '17 at 10:37

answered Oct 11 '17 at 10:15

armnotstrong

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Range is invalid, so `subarrayWithRange:` should crash. – Larme Oct 11 '17 at 10:16
@armnotstrong - what about `/en/`, but your joinedString returns `en/` – Anbu.Karthik Oct 11 '17 at 10:19
I did it another way and its working NSArray *strArray = [urlString componentsSeparatedByString:@"/"]; urlString = [urlString stringByReplacingOccurrencesOfString:strArray[0] withString:@""]; – user6788419 Oct 11 '17 at 10:21
@user6788419 what if the first pattern occur multi times? – armnotstrong Oct 11 '17 at 10:23
@armnotstrong yeah i got it – user6788419 Oct 11 '17 at 10:23
@armnotstrong it should be [array1 count]-1 Then its working fine – user6788419 Oct 11 '17 at 10:31
@user6788419 Yeah, have just checked that, when dealing with the range staff of arrays, I sometimes became very confused :D – armnotstrong Oct 11 '17 at 10:33

jscs · Answer 3 · 2017-10-12T10:46:34.113

Looks like you're working with a file path. So, use path manipulation methods:

@implementation NSString (MorePaths)

- (NSString *)WSSDroppingFirstRelativePathComponent
{
    NSArray * trailingComponents = [[self pathComponents] WSSDroppingFirst];
    return [NSString pathWithComponents:trailingComponents];
}

@end

@implementation NSArray (Dropping)

- (NSArray *)WSSDroppingFirst
{
    NSRange trailingRange = NSMakeRange(1, [self count] - 1);
    return [self subarrayWithRange:trailingRange];
}

@end

If this is actually a URL, make the category on NSURL instead of NSString.

Remove part of a string before the first forward slash

3 Answers3