使用正则表达式的文字中无效的转义序列 [英] Invalid escape sequence in literal with regex

问题描述

我定义一个字符串:

static let Regex_studio_tel = "^(0[0-9]{2,3}\-)?([2-9][0-9]{6,7})+(\-[0-9]{1,4})?$"

但是有一个问题:

文字中无效的转义序列

Invalid escape sequence in literal

我标记的图片:

编辑-1

我的要求是使用Regex匹配特殊的飞机号，例如:

My requirement is match special plane numbers use Regex, such as:

我公司有一个特殊的飞机号码:

My company have a special plane number：

028-65636688 or 85317778-8007  

// aaa-bbbbbbbb-ccc 我们知道 aaa 是前缀，它表示城市拨号代码，而 bbbbbbbb 是主要电话号码 cccc 是座机电话的分机号码

// aaa-bbbbbbbb-ccc we know the aaa is the prefix, and it means City Dialing Code， and bbbbbbbb is the main tel number, cccc is the landline telephone's extension number,

例如我公司的座机电话是 028-65636688 ，也许我们公司有10个分机号码: 028-65636688-8007，028-65636688-8006,028-65636688-8005 等.当然，它的末尾可能会有一个分机号.

such as my company's landline telephone is 028-65636688, maybe our company have 10 extension number: 028-65636688-8007 ,028-65636688-8006,028-65636688-8005 and so on. Of course, it maybe have a ext-number at the end.

028-65636688-2559

推荐答案

两个字符序列 \ -在Swift String中不是有效的转义序列.当需要将 \ -作为模式传递给 NSRegularExpression 时，需要在Swift String中编写 \\-文字.

Two character sequence \ - is not a valid escape sequence in Swift String. When you need to pass \ - to NSRegularExpression as pattern, you need to write \\- in Swift String literal.

因此，您的行应如下所示:

So, your line should be something like this:

static let Regex_studio_tel = "^(0[0-9]{2,3}\\-)?([2-9][0-9]{6,7})+(\\-[0-9]{1,4})?$"

---

添加

正如罗布(Rob)所说，减号不是出现在 [ ] 之外的正则表达式中的特殊字符，因此您可以将其写为:

As Rob commented, minus sign is not a special character in regex when appearing outside of [ ], so you can write it as:

static let Regex_studio_tel = "^(0[0-9]{2,3}-)?([2-9][0-9]{6,7})+(-[0-9]{1,4})?$"

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