回答編集履歴
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修正
answer
CHANGED
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@@ -1,10 +1,12 @@
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```javascript
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let ary = [
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'-', '―', '-123,456', '234,567,890', '123', '0', '10,123',
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'1,234,567,890', '1,234,567,890,123',
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'--', '――', '+123', '012,345', '1234,567'
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];
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//let reg = /^(-?[1-9]\d{1,2}?(,\d{3})*|0|-|―)$/;
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-
let reg = /^(-?[1-9]\d
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9
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let reg = /^(-?[1-9]\d?\d?(,\d{3})*|0|-|―)$/;
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ary.forEach (a => {
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console.log (a, reg.test (a));
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