Simple alphanumeric string validation with anchors, regular character classes and limiting quantifiers. No Unicode stuff. Beginner level.

REGEX TESTER LINK:
- [ Ссылка ]

FURTHER LINKS:

- Anchors (^ and $): [ Ссылка ]
- Character classes ([A-Z] and [0-9]): [ Ссылка ]
- Limiting quantifiers ({1,2} and {5}): [ Ссылка ]

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