Avoid? No. Just use them with double backslash in RegExp constructor.

So, are you saying that we should avoid All the built-in character set such as \d, \w, \s, etc? \d is not the only char set that have a backslash (escaped). How about other escaped characters that we can't construct manually such as word boundaries? (\b & \B) ?

Same for Javascript, but only if we use new RegExp(regString) constructor.
We must use \\d instead of \d. Or [0-9]. Or String.raw`\d`

Wow!! 😂👍👍😂😊😊