NSString用单个换行符替换重复的换行符 [英] NSString replace repeated newlines with single newline

问题描述

我有一个 NSString ，它可以在字符串之间有多个\ n。我需要用单个\ n替换多次出现的\ n。

I have an NSString which can have multiple \n in between the string. I need to replace the multiple occurrence of \n's with a single \n.

我试过这段代码：

newString = [string stringByReplacingOccurrencesOfString:@"\n\n" withString:@"\n"];

但是，如果出现一系列\ n \ n在字符串中遇到n \ nn \ n \\ n。在这种情况下，它们将被替换为\ n \ nn \ n。

But this does not give the desired result if a series of "\n\n\n\n\n\n" is encountered in the string. In this case, they will be replaced with "\n\n\n".

我该怎么办才能使所有多个\ n用单个\ n取代？

What should I do so that all more than one "\n"s be replaced with single "\n"?

全部谢谢！

更新：添加已过滤字符串设置为文本的 UITextView 的屏幕截图。根据Attila H的回答，在编写代码后，新行似乎不止一行。

Update: Adding a screenshot for UITextView to which the filtered string is set as text. The new lines seem to be more than one after writing code as suggested by Attila H in answer.

推荐答案

您可以使用 NSRegularExpression 。这是最简单和优雅的方式：

You might use NSRegularExpression. This is the most simple and elegant way:

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\n+" options:0 error:NULL];
NSString *newString = [regex stringByReplacingMatchesInString:string options:0 range:NSMakeRange(0, [string length]) withTemplate:@"\n"];

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