如何检测 NSString 中以“@"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，它需要检测您何时在 UITextView 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.

如何查找 NSString 中以@"或#"字符开头的所有单词?

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，其模式类似于 #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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