如何在NSString中检测以“@”或“＃”开头的单词？ [英] How do you detect words that start with “@” or “#” within an NSString?

问题描述

我正在构建一个Twitter iPhone应用程序，它需要检测何时在UITextView中的字符串中输入主题标签或@ -mention。

I'm building a Twitter iPhone app, and it needs to detect when you enter a hashtag or @-mention within a string in a UITextView.

如何做我发现NSString中的所有单词都以@或＃字符开头？

How do I find all words preceded by the "@" or "#" characters within an NSString?

感谢您的帮助！

推荐答案

您可以使用 NSRegularExpression 类，其格式为＃\ w +（\ w代表单词字符）。

You can use NSRegularExpression class with a pattern like #\w+ (\w stands for word characters).

NSError *error = nil;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"#(\\w+)" options:0 error:&error];
NSArray *matches = [regex matchesInString:string options:0 range:NSMakeRange(0, string.length)];
for (NSTextCheckingResult *match in matches) {
    NSRange wordRange = [match rangeAtIndex:1];
    NSString* word = [string substringWithRange:wordRange];
    NSLog(@"Found tag %@", word);
}

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