Replace String Between Two Strings

Question

I have a serious problem about indexing in array. I've been working on this for 2 days and couldn't find answer yet.

I want to do that, search specific character in array then replace it with other string. I'm using replaceObjectAtIndex method but my code is doesn't work.

Here is my code;

    NSString *commentText = commentTextView.text;
    NSUInteger textLength = [commentText length];
    NSString *atSign = @"@";
    NSMutableArray *commentArray = [[NSMutableArray alloc] init];
    [commentArray addObject:commentText];

    for (int arrayCounter=1; arrayCounter<=textLength; arrayCounter++)
    {
        NSRange isRange = [commentText rangeOfString:atSign options:NSCaseInsensitiveSearch];
        if(isRange.location != NSNotFound)
        {
            commentText = [commentText stringByReplacingOccurrencesOfString:commentText withString:atSign];
            [_mentionsearch filtrele:_mentionText];
            id<textSearchProtocol> delegate;
            [delegate closeList:[[self.searchResult valueForKey:@"user_name"] objectAtIndex:indexPath.row]];
        }
    }

Ok, now i can find "@" sign in the text and i can match it. But this is the source of problem that, i can not replace any string with "@" sign. Here is the last part of code;

    -(void)closeList
    {
        NSArray *arrayWithSign = [commentTextView.text componentsSeparatedByString:@" "];
        NSMutableArray *arrayCopy = [arrayWithSign mutableCopy];
        [arrayCopy replaceObjectAtIndex:isRange.location withObject:[NSString stringWithFormat:@"@%@",username]];
    }

When im logging isRange.location value, it returns correct. But when im try to run, my application is crashing. So, i can not replacing [NSString stringWithFormat:@"@%@",username] parameter. How can i solve this problem?

Why are you trying to use a range taken from a string search as the index into an array? — Wain
– Wain, Commented Jan 24, 2014 at 12:22
There is no log downside. Only thing i have, (lldb) 0x6ae8952:jae 0x6ae8962 ; __pthread_kill + 26. — Kemal Can Kaynak
– Kemal Can Kaynak, Commented Jan 24, 2014 at 12:22
In NSRange isRange = [commentText rangeOfString:atSign options:NSCaseInsensitiveSearch]; and in [arrayCopy replaceObjectAtIndex:isRange.location withObject:[NSString stringWithFormat:@"@%@",username]]; variable isRange is same? — Ruslan Soldatenko
– Ruslan Soldatenko, Commented Jan 24, 2014 at 12:44
Try this to remove @ from string NSString *replacedstr=[YourString stringByReplacingOccurrencesOfString:@"@" withString:@""]; — Pradhyuman sinh
– Pradhyuman sinh, Commented Jan 24, 2014 at 12:52

tanz · Accepted Answer · 2014-01-24 12:38:42Z

2

If I understand correctly you want to change a substring in a string with a new string. In this case, why don't you use directly the stringByReplacingOccurrencesOfString method of NSString:

NSString *stringToBeChanged = @"...";
NSString *stringToBeChangedWith = @"...";
NSString *commentTextNew = [commentText stringByReplacingOccurrencesOfString:stringToBeChanged withString:stringToBeChangedWith];

answered Jan 24, 2014 at 12:38

tanz

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2 Comments

Kemal Can Kaynak Over a year ago

I did big mistake about array results. That is solution thx :)

MANCHIKANTI KRISHNAKISHORE Over a year ago

i want to change the string in between "<>" <my stirng> to < new tring> my string is they dynamic string then how can i identify the string

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