ios - 检查子字符串是否在范围内

Question

在iOS中，

Given an URL https://whateverthisisanurl.google.com/helloworld

如果我想测试Google在//和/ /之间是否存在，有什么好方法？

Answer 1

尝试这个

NSString *mystring = @"https://whateverthisisanurl.google.com/helloworld";
NSString *regex = @".*?//.*?\\.google\\..*?/.*?";

NSPredicate *regextest = [NSPredicate
                         predicateWithFormat:@"SELF MATCHES %@", regex];

if ([regextest evaluateWithObject:mystring] == YES) {
    NSLog(@"Match!");
} else {
    NSLog(@"No match!");
}