Syntax
- NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:PATTERN options:OPTIONS error:ERROR];
- NSArray<NSTextCheckingResult *> *results = [regex matchesInString:STRING options:OPTIONS range:RANGE_IN_STRING];
- NSInteger numberOfMatches = [regex numberOfMatchesInString:STRING options:OPTIONS range:RANGE_IN_STRING];
