回答編集履歴
1
別解
test
CHANGED
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@@ -19,3 +19,21 @@
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19
19
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end
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20
20
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21
21
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```
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22
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+
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23
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+
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24
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25
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追記：
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26
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+
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27
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すいません。単にこれでよさそうです
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28
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+
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29
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+
```lang-Ruby
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30
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+
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31
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def check(str)
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32
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33
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/\A[\w@-]*[A-Za-z][\w@-]*\z/ =~ str
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34
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+
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35
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end
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36
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+
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37
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```
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38
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+
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39
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+
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