Swift：获取字符串中子字符串的起始索引

Question

有没有办法在字符串中搜索子字符串开头的索引？

赞，"hello".indexOf("el")会返回1.谢谢

Answer 1

您可以使用 select coalesce(concat(ages.n, ' year'), 'More than 10 year') as custom_text, count(t.age) from (select 1 as n union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9 union all select 10 union all select null ) ages left join tabla t on (case when ages.n<11 then t.age = ages.n else t.age > 10 end) group by ages.n; 函数找到并返回给定范围内给定字符串第一次出现的范围，如下所示：

rangeOfString

我希望这对你有所帮助。