eval 해답 번역#225

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1000peach wants to merge1 commit intojavascript-tutorial:masterfrom1000peach:solution_eval

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1000peach wants to merge1 commit intojavascript-tutorial:masterfrom1000peach:solution_eval

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eval/solution.md 번역입니다. 리뷰 부탁드립니다.

eval solution.md 번역

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		To make things safe, and limit it to arithmetics only, we can check the `expr` using a [regular expression](info:regular-expressions), so that it only may contain digits and operators.
		입력한 문자열을 산술적으로 제한하여 안전하게 eval로 실행하기 위해, [정규 표현식](info:regular-expressions)을 사용하여 `expr`을 검사하면 숫자와 연산자만 포함하게 됩니다.

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입력한 문자열을 산술적으로 제한하여라는 말이 잘 안와닿네요.
산술식만 입력하도록 제한한다는 의미인데, 조금 풀어써주세요.

		@@ -1,11 +1,11 @@
		Let's use`eval` to calculate the maths expression:
		산술 표현식을 계산하기 위해`eval`을 사용해봅시다.

		```js demo run
		let expr = prompt("Type an arithmetic expression?", '2*3+2');