正则表达式有效Twitter提及

Question

我试图找到匹配的正则表达式,如果推文是真正的提及.值得一提的是,字符串不能以"@"开头,不能包含"RT"(不区分大小写),"@"必须以单词开头.

在示例中,我评论了所需的输出

一些例子:

function search($strings, $regexp) {
    $regexp;
    foreach ($strings as $string) {
        echo "Sentence: \"$string\" <- " .
        (preg_match($regexp, $string) ? "MATCH" : "NO MATCH") . "\n";
    }
}

$strings = array(
"Hi @peter, I like your car ", // <- MATCH
"@peter I don't think so!", //<- NO MATCH: the string it's starting with @ it's a reply
"Helo!! :@ how are you!", // NO MATCH <- it's not a word, we need @(word) 
"Yes @peter i'll eat them this evening! RT @peter: hey @you, do you want your pancakes?", // <- NO MATCH "RT/rt" on the string , it's a RT
"Helo!! ineed@aser.com how are you!", //<- NO MATCH, it doesn't start with @
"@peter is the best friend you could imagine. RT @juliet: @you do you know if @peter it's awesome?" // <- NO MATCH starting with @ it's a reply and RT
);
echo "Example 1:\n";
search($strings,  "/(?:[[:space:]]|^)@/i");

当前输出:

Example 1:
Sentence: "Hi @peter, I like your car " <- MATCH
Sentence: "@peter I don't think so!" <- MATCH
Sentence: "Helo!! :@ how are you!" <- NO MATCH
Sentence: "Yes @peter i'll eat them this evening! RT @peter: hey @you, do you want your pancakes?" <- MATCH
Sentence: "Helo!! ineed@aser.com how are you!" <- MATCH
Sentence: "@peter is the best friend you could imagine. RT @juliet: @you do you know if @peter it's awesome?" <- MATCH

编辑:

我需要它在正则表达式,因为它也可以用于MySQL和其他语言.我不是在寻找任何用户名.我只想知道字符串是否提及.

Answer 1

这个regexp可能会更好一些: /\B\@([\w\-]+)/gim

这里有一个jsFiddle示例:http://jsfiddle.net/2TQsx/96/

Answer 2

这是一个应该有效的正则表达式:

/^(?!.*\bRT\b)(?:.+\s)?@\w+/i

说明:

/^             //start of the string
(?!.*\bRT\b)   //Verify that rt is not in the string.
(?:.*\s)?      //Find optional chars and whitespace the
                  //Note: (?: ) makes the group non-capturing.
@\w+           //Find @ followed by one or more word chars.
/i             //Make it case insensitive.