解析每次可能具有不同值的字符串

Question

我有以下字符串：

"---\n- :@error: 'Invalid phone number format: ''''.  Please check that your format  for\n    phone number is correct.'\n- :@error: 'Invalid id was sent: '\n- :@error: 'Invalid date format: '\n"

我试图只返回错误消息。那就是

• "Invalid phone number format:"
• "Please check that your format for phone number is correct."
• "Invalid id was sent:"
• "Invalid date format:"

将返回的某些消息将与上面的消息不同，因此我不认为使用正则表达式匹配将是最好的方法。有什么想法我只能从这个字符串中提取错误消息吗？

Answer 1

试试这个，它并不完美，但要做到这一点。

s = "---\n- :@error: 'Invalid phone number format: ''''.  Please check that your format  for\n    phone number is correct.'\n- :@error: 'Invalid id was sent: '\n- :@error: 'Invalid date format: '\n"
# scan will get the strings between quotes that are not themselves quotes
# it returns an array of arrays
# flatten will make it a single array
# gsub then strip will normalize the results.
msgs = s.scan(/'([^']+)'/).map{ |(msg)| msg.gsub(/(\.|\s+)/, ' ').strip }

#["Invalid phone number format:", 
# "Please check that your format for phone number is correct", 
# "Invalid id was sent:", 
# "Invalid date format:"]

Answer 2

尝试将字符串拆分为@error。

error_messages = string.split('@error')
error_messages.each {|e| p e.gsub(/[\n:'-]/, '').strip}

返回以下内容

"Invalid phone number format .  Please check that your format for    phone number is correct."
"Invalid id was sent"
"Invalid date format"

我已经非常接近，我只需要玩这个，看看我是否可以编辑空白。

Answer 3

这是一个YAML字符串，所以请对其进行处理。你的生活会更轻松：

require 'yaml'

str = "---\n- :@error: 'Invalid phone number format: ''''.  Please check that your format  for\n    phone number is correct.'\n- :@error: 'Invalid id was sent: '\n- :@error: 'Invalid date format: '\n"

error = YAML.load(str)
error = YAML.load(str)
# => [{:@error=>
#       "Invalid phone number format: ''.  Please check that your format  for phone number is correct."},
#     {:@error=>"Invalid id was sent: "},
#     {:@error=>"Invalid date format: "}]

我们现在可以看到它是一系列错误。看第一个：

error[0] # => {:@error=>"Invalid phone number format: ''.  Please check that your format  for phone number is correct."}

现在可以轻松访问错误：

error[0][:@error] # => "Invalid phone number format: ''.  Please check that your format  for phone number is correct."

Answer 4

your_string.scan(/@error: '(.*): ?'/)将返回错误消息数组。

Answer 5

在我看来，每个错误消息（开头的"---\n"除外）都以连字符开头，以换行符结束。如果是这样，您可以按如下方式提取它们：

str = "---\n- :@error: 'Invalid phone number format: ''''.  Please check that your format  for\n    phone number is correct.'\n- :@error: 'Invalid id was sent: '\n- :@error: 'Invalid date format: '\n"

str.scan(/-.*?\n(?=-|$)/m)[1..-1]
  #=> ["- :@error: 'Invalid phone number format: ''''.  Please check that your format  for\n    phone number is correct.'\n",
  #    "- :@error: 'Invalid id was sent: '\n",
  #    "- :@error: 'Invalid date format: '\n"]

注意：

• [1..-1]会丢弃初始匹配"---\n"。
• 多行修饰符/m是必需的，因为每条错误消息都可能包含换行符。
{li} ? .*?使.*懒惰。没有它，包含一个元素的数组（整个字符串）由str.scan(/-.*\n(?=-|$)/m)返回，因此以下[1..-1]返回一个空数组。
• 正向前瞻(?=-|$)/m)可确保错误消息的结尾紧跟一个连字符或字符串的结尾。