从字符串创建 Twitter 句柄数组

Question

我正在寻找一种方法来分析字符串并创建一个包含所有@Handles 的数组（如 Twitter）。稍加改动，@Handles 可以包含句点“。”

所以：@Username、@User_Name 或 @User.Name。

我的方法是使用 RegEx，但我似乎遇到了一个错误，我不确定我是如何产生的。

我的字符串是“@Albert and @David_Man and @Bob.Joe”，但返回的用户名数组是“@Albert, @David, @Bob”，RegEx 忽略了下划线和句点。

这是我的代码：

NSError *error = nil;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"@([a-zA-Z0-9_\\.]{0,30})" options:NSRegularExpressionCaseInsensitive error:&error];
NSArray *matches = [regex matchesInString:myString options:0 range:NSMakeRange(0, myString.length)];

Answer 1

也许你应该试试这个......

NSRegularExpression *regexForUserNameTag = [NSRegularExpression regularExpressionWithPattern: @"@[A-Za-z0-9._]{0,30}" options:0 error:&error];
NSArray *matchesUserName = [regexForUserNameTag matchesInString:yourString options:0 range:NSMakeRange(0, yourString.length)];
for (NSTextCheckingResult *match in matchesUserName) {
    NSRange wordRange = [match rangeAtIndex:0];
    NSString* word = [yourString substringWithRange:wordRange];
    [usernames addObject: word];
}

Answer 2

NSError *error = nil;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"@([a-zA-Z0-9_\\.]{0,30})" options:NSRegularExpressionCaseInsensitive error:&error];
NSArray *matches = [regex matchesInString:myString options:0 range:NSMakeRange(0, myString.length)];
NSMutableArray *usernames = [NSMutableArray array];
for (NSTextCheckingResult *match in matches) {
  [usernames addObject:[myString substringWithRange:match.range]];
}

Answer 3

NSArray *badChars = @[".", ",", ";", ...]; //chars you don't want to be in username
NSString *string = "@Albert and @David_Man and @Bob.Joe";
NSArray *array = [string componentsSeparatedByString:@" "];
for(int i=array.count-1;i>0;i--){
    NSString *str=array[i];
    if(![str[0] isEqual:@"@"]){[array removeObjectAtIndex:i]}
    for(NSString *badChar in badChars){
         str = [str stringByReplacingOccurencesOfString:badChar withString:""];
    }
}