Tutorial

Regex Cross­word中的专题Tutorial共有九个谜题，其解答分别如下：

1. The OR symbol
   The OR symbol
2. A Range of characters
   A Range of characters
3. Characters NOT to include
   Characters NOT to include
4. Zero or more
   Zero or mor
5. Zero or one
   Zero or one
6. One or more
   One or more
7. Backreference
   Backreference
8. Specific amount
   Specific amount
9. Space
   Space