如何用数字表示 REGEX OR？

Question

\d{1,2}｜\d{5,}
(\d{1,2})｜(\d{5,})

I want to match 1-2 digits or more than 5 digits. Why both patterns above not working? I suppose this should match the second half:

s = 12345

S is a digit, not str. But it doesn't match at all.

Answer 1

You are missing word bounds. \b around the things you want to catch.

Something like this should do the trick.

\b\d{1,2}\b|\b\d{5,}\b

Here's a handy cheat sheet I like to use. Link

Answer 2

1. Remove the spaces around the pipe.
2. Put the largest regex in the first part of alternation: \d{5,}|\d{1,2}
3. Anchor your regex: ^(?:\d{5,}|\d{1,2})$

Demo & explanation