将空白区域的序列折叠为单个字符和修剪字符串 [英] Collapse sequences of white space into a single character and trim string

问题描述

考虑以下示例：

"    Hello      this  is a   long       string!   "

我想将其转换为：

"Hello this is a long string!"

推荐答案

OS X 10.7+和iOS 3.2 +

使用hfossli提供的原生 regexp解决方案。

使用您喜欢的regexp库或使用以下Cocoa原生解决方案：

Either use your favorite regexp library or use the following Cocoa-native solution:

NSString *theString = @"    Hello      this  is a   long       string!   ";

NSCharacterSet *whitespaces = [NSCharacterSet whitespaceCharacterSet];
NSPredicate *noEmptyStrings = [NSPredicate predicateWithFormat:@"SELF != ''"];

NSArray *parts = [theString componentsSeparatedByCharactersInSet:whitespaces];
NSArray *filteredArray = [parts filteredArrayUsingPredicate:noEmptyStrings];
theString = [filteredArray componentsJoinedByString:@" "];

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