有人可以向我解釋此RegEx嗎？

Question

我看到這行代碼和正則表達式只是嚇壞了我......

quickExpr = /^(?:[^#<]*(<[\w\W]+>)[^>]*$|#([\w\-]*)$)/ 

能有人請解釋一點一點它做什麼？ 感謝，G

Answer 1

這是我可以提取：

• ^開頭的字符串。
• (?:不匹配組。
• [^#<]*任何數量的連續字符不是#或<。
• (<[\w\W]+>)一個匹配字符串的組，如<anything_goes_here>。
• [^>]*任意數量的字符順序不是>。

|後面的部分表示如果第一個失敗，則嘗試使用第二個正則表達式。那一個是#([\w\-]*)：

• #的#字符匹配。不那麼複雜。
• ([\w\-]*)是匹配任意數量的單詞字符或短劃線的組。基本上Things-of-this-form
• $標誌着正則表達式的結束。

我不是正則表達式親，所以請糾正我，如果我錯了。

Answer 2

^(?:[^#<]*(<[\w\W]+>)[^>]*$|#([\w\-]*)$) 

Assert position at the start of the string «^» 
Match the regular expression below «(?:[^#<]*(<[\w\W]+>)[^>]*$|#([\w\-]*)$)» 
    Match either the regular expression below (attempting the next alternative only if this one fails) «[^#<]*(<[\w\W]+>)[^>]*$» 
     Match a single character NOT present in the list "#<" «[^#<]*» 
     Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*» 
     Match the regular expression below and capture its match into backreference number 1 «(<[\w\W]+>)» 
     Match the character "<" literally «<» 
     Match a single character present in the list below «[\w\W]+» 
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+» 
      Match a single character that is a "word character" (letters, digits, etc.) «\w» 
      Match a single character that is a "non-word character" «\W» 
     Match the character ">" literally «>» 
     Match any character that is not a ">" «[^>]*» 
     Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*» 
     Assert position at the end of the string (or before the line break at the end of the string, if any) «$» 
    Or match regular expression number 2 below (the entire group fails if this one fails to match) «#([\w\-]*)$» 
     Match the character "#" literally «#» 
     Match the regular expression below and capture its match into backreference number 2 «([\w\-]*)» 
     Match a single character present in the list below «[\w\-]*» 
      Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*» 
      Match a single character that is a "word character" (letters, digits, etc.) «\w» 
      A - character «\-» 
     Assert position at the end of the string (or before the line break at the end of the string, if any) «$» 


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