convert a php code to objective C

Question

can someone please help me out writing this code in objective C :

function extractStringFromString ($string, $start, $end) {

    $startPos = strpos($string,$start);
    $stringEndTagPos = strpos($string,$end,$startPos);
    $stringBetween = substr($string,$startPos+strlen($start),$stringEndTagPos-$startPos-strlen($start));

    if (strlen($stringBetween) != 0) {

        return $stringBetween;
        return true;
    }
    else {

        return false;
    }

}

what the function does is simple, takes 3 values, $string which is a text and $start and $end which the function will look for in the text ($start will be the start of the search, and once start is found, $end will be the end of the search and it will return the value)

Thanks

Daniel · Accepted Answer · 2011-08-30 12:59:24Z

4

-(NSString*)extractStringFromString:(NSString*)text fromIndex(NSInteger)start toIndex:(NSInteger)end{
    NSRange cropRange = {start, [text length] - end};
    return [text substringWithRange: cropRange];

}

But of course you should really just use:

    NSRange cropRange = {aStartIndex, aLength};
    NSString* substring = [text substringWithRange: cropRange];

answered Aug 30, 2011 at 12:59

Daniel

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1 Comment

Nekto Over a year ago

They are not equivalent. You are not searching for substring indexes.

Nekto · Accepted Answer · 2011-08-30 13:45:54Z

2

Searches first start string and last end string

- (NSString *)extractStringFromString:(NSString *)string start:(NSString *)start end:(NSString *)end
{
    NSRange indexStart = [string rangeOfString:start];
    if (indexStart.location == NSNotFound) return nil;

    NSRange searchRange = NSMakeRange(indexStart.location + indexStart.length, [string length] - indexStart.location - indexStart.length);
    NSRange indexEnd = [string rangeOfString:end options:NSBackwardsSearch range:searchRange];
    if (indexEnd.location == NSNotFound) return nil;

    return [string substringWithRange:NSMakeRange(indexStart.location + indexStart.length, indexEnd.location - indexStart.location - indexStart.length)];
}

Searches first start string and first end string after first start string:

- (NSString *)extractStringFromString:(NSString *)string start:(NSString *)start end:(NSString *)end
{
    NSRange indexStart = [string rangeOfString:start];
    if (indexStart.location == NSNotFound) return nil;

    NSRange searchRange = NSMakeRange(indexStart.location + indexStart.length, [string length] - indexStart.location - indexStart.length);
    NSRange indexEnd = [string rangeOfString:end options:NSLiteralSearch range:searchRange];
    if (indexEnd.location == NSNotFound) return nil;

    return [string substringWithRange:NSMakeRange(indexStart.location + indexStart.length, indexEnd.location - indexStart.location - indexStart.length)];
}

edited Aug 30, 2011 at 13:45

answered Aug 30, 2011 at 13:00

Nekto

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6 Comments

ahoura Over a year ago

thanks alot man, the line "return [string..." returns an error (program received signal "sigabrt") , any idea why?? :)

Nekto Over a year ago

Give me, please, the example of your call. (input strings)

ahoura Over a year ago

this is the code : NSString *html = [NSString stringWithContentsOfURL:[NSURL URLWithString: @"radarurl.com/url/twtio.com"]]; NSString *siteID = [self extractStringFromString:html start:@"var SITE_ID = " end:@";"];

ahoura Over a year ago

hey thanks, now it doesnt return an error but it doesnt return the right string, it actually returns the entire html page (if you test it on xcode)

Nekto Over a year ago

Check your test data. I've tested it and it works fine. Use NSLog() for checking values of all input strings.

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