ruby​​中的正則表達式有什麼問題？

Question

我在寫一個小型的ruby程序，需要從提供給它的字符串中提取時間和日期......它最終會猜測它是什麼類型的約會/會議，並用它來最好地爲用戶服務。不幸的是，下面的正則表達式在我的崇高文本正則表達式搜索中起作用，但不在紅寶石中。

email = " 
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require 'time' 


#January February March April May June July August September October November December 
r = /(jan(|uary)|feb(|uary)|mar(|ch)|apr(|il)|may|jun(|e)|jul(|y)|aug(|ust)|sept(|tember)|oct(|ober|)|nov(|ember)|dec(|ember)|(\b([1-9]|[12][0-9]|3[01])\b))(|/|,|)(([0-3]|)[0-9]|)(, |\/|)\b2[0-9]{3}\b/ 
if email[r] 
    puts email[r] 
    date =Date.parse(email[r]) 
    puts " We found a date.. Let's see if we can find a time: #{date}" 

    if date< Date.today 
    puts "Why do we need to worry about this?" 
    else 
    r = /([0-9]|)[0-9]:[0-9][0-9][ |pm|am|](am|pm)/ 
    if email[r] 
     time = Time.parse("#{email[r]} #{date}") 
     puts "Found time #{time}" 
     if time<Time.now 
      puts "Error: Time before #{Time.now}" 
     else 
      #Great! 
      puts "Finished let's add it." 

     end 
    end 
    end 
end 

拋出這些錯誤：

/Users/michael/Downloads/parse.rb:27: end pattern with unmatched parenthesis: /(jan(|uary)|feb(|uary)|mar(|ch)|apr(|il)|may|jun(|e)|jul(|y)|aug(|ust)|sept(|tember)|oct(|ober|)|nov(|ember)|dec(|ember)|(\b([1-9]|[12][0-9]|3[01])\b))(|/ 
/Users/michael/Downloads/parse.rb:27: syntax error, unexpected ',' 
...1-9]|[12][0-9]|3[01])\b))(|/|,|)(([0-3]|)[0-9]|)(, |\/|)\b... 
...        ^
/Users/michael/Downloads/parse.rb:27: syntax error, unexpected ')' 
...-9]|3[01])\b))(|/|,|)(([0-3]|)[0-9]|)(, |\/|)\b2[0-9]{3}\b/ 
...        ^
/Users/michael/Downloads/parse.rb:27: syntax error, unexpected ']', expecting ')' 
...[01])\b))(|/|,|)(([0-3]|)[0-9]|)(, |\/|)\b2[0-9]{3}\b/ 
...        ^
/Users/michael/Downloads/parse.rb:49: syntax error, unexpected end-of-input, expecting ')' 

Answer 1

你在你的正則表達式的轉義正斜槓。您可以使用Rubular來測試您的表情，如http://rubular.com/r/TvoKOsSImt

Answer 2

更改/至\/。

意思是說，在你寫正向表達式或反斜槓之前，在它們前面加一個額外的反斜槓（\）。

Answer 3

更改此：(, |/|)這個(, |\/|)

的轉義斜槓是造成紅寶石正則表達式編譯器認爲你已經提前終止的正則表達式。在斜槓之前添加反斜槓使其在正則表達式中被視爲正常斜槓，而不是被解釋爲指示正則表達式結束的分隔符。