Question

我正在编写一个小型ruby程序，需要从给定的字符串中提取时间和日期...它最终会猜测它是什么类型的约会/会议并使用它来最好地为用户服务。不幸的是，下面的正则表达式在我的崇高文本正则表达式搜索中起作用，但在ruby中不起作用。

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

引发这些错误：

/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

你的正则表达式中有一个未转义的正斜杠字符。您可以使用Rubular来测试表达式，如http://rubular.com/r/TvoKOsSImt

Answer 2

将/更改为\/。

意思是，在你的正则表达式中写正向或反斜杠之前，在它们之前加一个反斜杠（\）。

Answer 3

将此更改：(, |/| )更改为此(, |\/| )

未转义的斜杠导致ruby正则表达式编译器认为您已提前终止了正则表达式。在斜杠之前添加反斜杠会使其在正则表达式中被视为正常斜杠，而不是被解释为指示正则表达式结束的分隔符。

我的红宝石正则表达怎么了？

3 个答案: