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

Answer 1

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)];
}