從字符串中提取以字母開頭的單詞

Question

我想提取所有以@開頭的單詞以字符串形式與php。

哪種方式最好？

編輯：我不想去取郵件

感謝

Answer 1

$matches = null; 
preg_match_all('/(?!\b)(@\w+\b)/','This is the @string to @test.',$matches) 

使用preg_match_all並採取前瞻的單詞的開始（(?!\b)）和字分隔符（\b）的優勢，你可以輕鬆實現這一點。分解：

/   # beginning of pattern 
    (?!\b) # negative look-ahead for the start of a word 
    (  # begin capturing 
    @  # look for the @ symbol 
    \w+  # match word characters (a-z, A-Z, 0-9 & _) 
    \b  # match until end of the word 
)   # end capturing 
/   # end of pattern 

demo