Find all locations of substring in NSString (not just first)

Question

There is a substring that occurs in a string several times. I use rangeOfString, but it seems that it can only find the first location. How can I find all the l

Answer 1

I suggest using regular expression because it's a more declarative way and has fewer lines of code to write.

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"%@" options:nil error:nil];
NSString *toSearchStr = @"12312 %@ Text %@ asdsa %@";
__block int occurs = 0;
[regex enumerateMatchesInString:toSearchStr options:0 range:NSMakeRange(0, toSearchStr.length) usingBlock:^(NSTextCheckingResult * _Nullable result, NSMatchingFlags flags, BOOL * _Nonnull stop) {
       occurs++;
}];
// occurs == 3