有人可以向我解释此正则表达式吗？

Question

我看到这行代码和正则表达式让我感到恐慌...

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

有人可以一点一点解释它的作用吗？ 谢谢，G

Answer 1

^(?:[^#<]*(<[\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\-]*)$»
      Match the character "#" literally «#»
      Match the regular expression below and capture its match into backreference number 2 «([\w\-]*)»
         Match a single character present in the list below «[\w\-]*»
            Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
            Match a single character that is a "word character" (letters, digits, etc.) «\w»
            A - character «\-»
      Assert position at the end of the string (or before the line break at the end of the string, if any) «$»


Created with RegexBuddy

Answer 2

这是我可以提取的内容：

• ^字符串的开头。
• (?:不匹配的组。
• [^#<]*任何非#或<的连续字符。
• (<[\\w\\W]+>)与诸如<anything_goes_here>类的字符串匹配的组。
• [^>]*序列中任意多个不是>的字符。

|后的部分 表示如果第一个正则表达式失败，则尝试第二个正则表达式。 那是#([\\w\\-]*) ：

• #与#字符匹配。 没那么复杂。
• ([\\w\\-]*)是与任意数量的单词字符或破折号匹配的组。 基本上Things-of-this-form
• $标志正则表达式的结尾。

我不是regex专业人士，所以如果我写错了，请纠正我。