Post

arv

@arv.tools

This RegExp is O(1) if the string is `SeqOneByteString` 🎉 ```js const isOneByte = !/[^\x00-\xff]/.test(str); ```

2/4/26, 10:10 am0 reposts0 likes

arv

@arv.tools

2 Apr

However, if the string is a `SeqTwoByteString` and large it has to do a linear scan which of course is not so fast. Anyone have any tricks up their sleeves to detect if a string is a a two byte string in O(1)?