ruby - 正则表达式过早结束:/[^] +/

Question

我正在尝试使用NLP工具(“别名提取工具”)来处理某些日语文本文件。顺便说一句，我在docker容器上运行它。

docker操作系统镜像:Ubuntu 18.04

docker版本:18.06.0-ce

ruby 版本:1.8.7-p375 ​​

rbenv版本:1.1.1-39-g59785f6

jcode.rb

11:def _regex_quote(str)
str.gsub(/(\\[\[\]\-\\])|\\(.)|([\[\]\\])/) do
  $1 || $2 || '\\' + $3
end
end
 private :_regex_quote
151:def delete!(del)
return nil if del == ""
self.gsub!(DeletePatternCache[del] ||= /[#{_regex_quote(del)}]+/, '')
end

del_mark.rb

103:REG_PAREN = /[#{Regexp.quote((PAREN.keys+PAREN.values).join(''))}]/
    REG_BPAREN = /^([#{Regexp.quote(PAREN.keys.join(''))}])/
    (main.opts).on('-p','--end-paren','先頭と末尾の括弧のみ取り除く'){|d|
      options[:pat] = Array.new if options[:pat] == FULL_SET
      options[:pat].push(REG_BPAREN)
    }
    (main.opts).on('-P','--only-paren','括弧のみ_に置き換え'){|d| 
      options[:pat] = Array.new if options[:pat] == FULL_SET
      PAREN_OUT= '_'
      options[:pat].push(REG_PAREN)
   }
   #(main.opts).on('-d','--date'){
   #options[:pat].push(REG_DATE)
   #}
  (main.opts).on('-r','--remove'){
    options[:remove]=true
  }

    main.option
130:(ARGV+[$stdin]).each{|file|
    fi = file
    if file != $stdin
      fi = open(file)
    end
    main.input = fi 
    #puts "F:#{file}";
   138: main.exec{|line|
      unless line 
        main.is_line_write = false
        next
      end
  163:line.each_char{|char|
  #puts "C:#{char}"
  165:options[:pat].each{|pat|
        if pat == REG_BOU || pat == REG_BPAREN
        elsif pat == REG_PAREN
          char =char.sub(REG_PAREN,PAREN_OUT)
        else 
          reg = check_reg(char,pat)
          if reg
       # line.delete
       173:line.delete!("#{char}")
      # line.delete!("#{char[0,1]}\s?")
      # line = line[0..nchar-1] + line[nchar+char.size..line.size-1]
      # line.delete!(Regexp.quote(char))
        line.gsub!(reg,'')
        flag = true
        break
      end
    end

Cut.rb

if @is_data_array
    cd = Array.new
    @column.each{|c|
      cd.push(data[c])
    }
    func.call(cd)
  else
158: @column.each{|c|
      #puts "LINE:#{c},#{data[c]}";
  160: ret = @negrect_pattern == nil || !(data[c] =~ @negrect_pattern ) ? func.call(data[c]) : negrect(data[c]){|d| func.call(d)} 
      unless ret # if ret is nil
        is_write = false
        next
      end
      data[c] = ret
    }
  endenter code here

启动工具后，出现错误消息:

/root/.rbenv/versions/1.8.7-p375/lib/ruby/1.8/jcode.rb:153: warning: character class has `]' without escape
/root/.rbenv/versions/1.8.7-p375/lib/ruby/1.8/jcode.rb:153:in `delete!': premature end of regular expression: /[^]+/ (RegexpError)
from /ex-hyponymy-1.0/script/lib/del_mark.rb:173
from /ex-hyponymy-1.0/script/lib/del_mark.rb:165:in `each'
from /ex-hyponymy-1.0/script/lib/del_mark.rb:165
from /root/.rbenv/versions/1.8.7-p375/lib/ruby/1.8/jcode.rb:212:in `each_char'
from /root/.rbenv/versions/1.8.7-p375/lib/ruby/1.8/jcode.rb:211:in `scan'
from /root/.rbenv/versions/1.8.7-p375/lib/ruby/1.8/jcode.rb:211:in `each_char'
from /ex-hyponymy-1.0/script/lib/del_mark.rb:163
from /ex-hyponymy-1.0/script/lib/Cut.rb:160:in `call'
from /ex-hyponymy-1.0/script/lib/Cut.rb:160:in `exec'
from /ex-hyponymy-1.0/script/lib/Cut.rb:158:in `each'
from /ex-hyponymy-1.0/script/lib/Cut.rb:158:in `exec'
from /ex-hyponymy-1.0/script/lib/del_mark.rb:138
from /ex-hyponymy-1.0/script/lib/del_mark.rb:130:in `each'
from /ex-hyponymy-1.0/script/lib/del_mark.rb:130

我不明白这一点。我希望有人能帮助我。

Answer 1

不要将/[^]+/用作正则表达式:这是无效的。

Ruby 1.8.x1正则表达式引擎将[视为字符类的开始，并认为]和+是字符类中的字符-视为已处理字符的]可以遵循^ -negation而无需转义1 。

因此，字符类没有关闭-并引发了“[正则表达式]的“过早结束”错误。

上面的警告提供了一个指示符:“警告:字符类具有]'且没有转义”，表明]由于上述原因未关闭字符类。

1这是“旧Ruby”规则。 Ruby 2+(甚至可能是1.9+？)具有不同的正则表达式规则，并引发了一个“空字符类”错误，该错误不那么神奇，也不那么混乱。现在可能是更新所用Ruby版本的好时机。

也许不需要否定字符(/[+^]/或/[\^]+/)？还是在字符类(/[^f]+/)中有其他字符？还是要匹配除括号和加号之外的任何单个字符(Ruby 2+中的/[^]+]/或/[^\]+]/)？要么..

它实际上取决于正则表达式的实际意图。只需要以有效格式编写正则表达式即可。