You can get your url using like this...
NSRange divRange = [dateString rangeOfString:@"src=\"" options:NSCaseInsensitiveSearch];
if (divRange.location != NSNotFound)
{
NSRange endDivRange;
endDivRange.location = divRange.length + divRange.location;
endDivRange.length = [dateString length] - endDivRange.location;
endDivRange = [dateString rangeOfString:@".jpg" options:NSCaseInsensitiveSearch range:endDivRange];
if (endDivRange.location != NSNotFound)
{
divRange.location += divRange.length;
divRange.length = endDivRange.location - divRange.location + endDivRange.length;
NSLog(@"BinarySecurityToken : %@",[dateString substringWithRange:divRange]);
}
}