问题描述
我想匹配一个可以有字母和可选连字符的电话号码:
I want to match a phone number that can have letters and an optional hyphen:
- 这是有效的:
333-WELL - 这也是有效的:
4URGENT
- This is valid:
333-WELL - This is also valid:
4URGENT
换句话说，最多可以有一个连字符，但是如果没有连字符，则最多可以有七个0-9或A-Z字符.
In other words, there can be at most one hyphen but if there is no hyphen, there can be at most seven 0-9 or A-Z characters.
我不知道如何做和在正则表达式中使用"if语句".那有可能吗?
I dont know how to do and "if statement" in a regex. Is that even possible?
推荐答案
您正在寻找用竖线字符表示的交替运算符:|
You seek the alternation operator, indicated with pipe character: |
但是，您可能需要7个替代方法(每个连字符位置1个+不包含连字符1个)，或者您可能需要在第3个字符和第4个字符之间使用连字符，并使用2个替代方法.
However, you may need either 7 alternatives (1 for each hyphen location + 1 for no hyphen), or you may require the hyphen between 3rd and 4th character and use 2 alternatives.
交替运算符的一种用法定义了两种选择，如:
One use of alternation operator defines two alternatives, as in:
({3,3}[0-9A-Za-z]-{4,4}[0-9A-Za-z]|{7,7}[0-9A-Za-z])
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