正則表達式 - 連字符應該被轉義嗎？ [複製] - Regex - Should hyphens be escaped? [duplicate]

問題：

This question already has answers here : 這個問題在這裏已經有了答案：

Closed 9 years ago . 9年前關閉。

Possible Duplicate:可能的重複：
How to match hyphens with Regular Expression? 如何將連字符與正則表達式匹配？

Hyphen is a special character in regex, for instance, to select a range, I could do something like:連字符是正則表達式中的一個特殊字符，例如，要選擇一個範圍，我可以執行以下操作：

[0-9A-F]

But outside of square brackets it's just a regular character right?但是在方括號之外它只是一個普通字符，對嗎？ I've tested this on a couple of online regex testers, and hyphens seem to function as a normal character outside of square brackets (or even inside of square brackets if it's not in-between two characters - eg [-g] seems to match - or g) whether it's escaped or not.我已經在幾個在線正則表達式測試器上對此進行了測試，連字符似乎可以作爲方括號外的普通字符（如果不在兩個字符之間，甚至在方括號內 - 例如 [-g] 似乎匹配- 或 g) 它是否被轉義。 I couldn't find the answer to this, but I'm wondering whether or not it is conventional to escape hyphens.我找不到這個問題的答案，但我想知道逃避連字符是否是慣例。

Thanks!謝謝！

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解決方案：

參考一： https://en.stackoom.com/question/eEYU
參考二： https://stackoom.com/question/eEYU